Base Form, Past Form, Past Participle — Foundation Lesson 2

1 Concept

Every Verb Has Four Forms

🧱 Foundation — this lesson applies to every tense in the course

In Lesson 1 you learned that a verb changes form to show "when" something happens. That change isn't random — every verb in English, from a common irregular verb like go to any regular verb, has exactly four forms. Learn them for a verb, and you can build every tense in this course with it.

The same verb, four different shapes:

walk · walked · walked · walking

Grammar books call these forms Base Form, Past Form, Past Participle, and the -ing form. They are not four different verbs — they are four shapes of the same verb, and each shape has its own job.

This lesson is the toolbox. Every future lesson in this course will ask you to reach into it and pick the right form.

2 The Four Forms

Meet the Base Form, Past Form, Past Participle, and the -ing Form

Look at what happens to the verb "go":

Form	Example sentence	What it tells us
Base Form go	I go to school every day.	A present habit — also follows will / can / do
Past Form went	She went to school yesterday.	One finished past action — stands alone
Past Participle gone	She has gone to school every day this week.	Never alone — follows have/has/had, or be
-ing form going	She is going to school right now.	Never alone — follows be; also works as a noun

Go is irregular — notice that Past Form (went) and Past Participle (gone) are two completely different words. That's what makes an irregular verb irregular. Most verbs in English are not like this — most verbs are regular, meaning Past Form and Past Participle are identical and simply built by adding "-ed" to Base Form ("call → called → called"). You'll see this regular pattern in the next section.

3 Regular vs. Irregular

Same Job, Different Behavior

Regular verbs are predictable: Past Form and Past Participle are built by adding "-ed" to Base Form, and they always match. Irregular verbs don't follow that pattern — Past Form and Past Participle are often two completely different words, and you simply have to memorize them.

Base Form	Past Form	Past Participle	-ing form
go	went	gone	going
see	saw	seen	seeing
take	took	taken	taking
write	wrote	written	writing
speak	spoke	spoken	speaking

Regular — predictable (+ed)

walk
look
play
watch
want
call
use
ask

Past Form and Past Participle are always identical.

Irregular — memorize them

go / went / gone
have / had / had
do / did / done
make / made / made

Past Form and Past Participle are often different words.

There's no shortcut for irregular verbs — but this course only ever uses the top 100 most common verbs, so once you know their forms, you're set for almost everything you'll read and hear.

4 Spelling Rules

Building Past Form / Past Participle (-ed) and the -ing Form

For regular verbs, four spelling rules cover almost every case:

Rule	Base Form	-ed form	-ing form
Just add -ed / -ing	play	played	playing
Ends in silent -e: drop it first	live	lived	living
Consonant + y → i for -ed (keep y for -ing)	try	tried	trying
Short verb, stressed final syllable: double the consonant	stop	stopped	stopping

Common mistakes: stoped ✗ → stopped ✓ — double the "p" because "stop" is short with one vowel + one consonant. Tryed ✗ → tried ✓ — change "y" to "i" before "-ed", but never before "-ing" (trying, not triing).

5 Putting It Together

Which Form Follows Which Helping Verb?

This is the single most useful pattern in English grammar. Once it's automatic, every tense in this course becomes easy to build correctly.

will / can / do / does / did + Base Form → She will go. He doesn't go.

have / has / had + Past Participle → She has gone. They had eaten.

am / is / are / was / were + -ing form → She is going. They were eating.

am / is / are / was / were + Past Participle (passive) → The letter was written yesterday.

Past Form is the only form that never needs a helping verb. It stands completely alone: She walked. He went. Every other form always needs a partner.

6 Practice

Try It Yourself

Exercise A — Identify the Form

Click which form is used in each sentence.

1

She walks to work every morning.

✓ Correct — "walks" is the base form with -s added for "she," standing alone with no helping verb.
2

They watched a movie last night.

✓ Correct — "watched" is the Past Form, standing alone with no helping verb, for one finished past action.
3

He has eaten breakfast already.

✓ Correct — "eaten" is the Past Participle, following the helping verb "has."
4

We are writing a report right now.

✓ Correct — "writing" is the -ing form, following the helping verb "are."
5

The window was broken during the storm.

✓ Correct — "broken" is the Past Participle, following "was" to form the passive.
6

I call my parents every weekend.

✓ Correct — "call" is the base form, standing alone with no helping verb.
7

She spoke to the manager yesterday.

✓ Correct — "spoke" is the Past Form, standing alone, for one finished past action.
8

They are studying for the exam.

✓ Correct — "studying" is the -ing form, following the helping verb "are."

Exercise B — Spelling

Type the -ed or -ing form requested.

1

stop → (-ing form)
2

live → (-ed form)
3

try → (-ed form)
4

try → (-ing form)
5

call → (-ing form)
6

play → (-ed form)
7

use → (-ing form)
8

carry → (-ed form)

Exercise C — Regular or Irregular?

Click your answer for each verb.

1

walk → walked → walked

✓ Correct — walk is regular. Past Form and Past Participle are identical, built by adding -ed.
2

go → went → gone

✓ Correct — go is irregular. Past Form (went) and Past Participle (gone) are different words.
3

watch → watched → watched

✓ Correct — watch is regular. Past Form and Past Participle are identical, built by adding -ed.
4

write → wrote → written

✓ Correct — write is irregular. Past Form (wrote) and Past Participle (written) are different words.
5

want → wanted → wanted

✓ Correct — want is regular. Past Form and Past Participle are identical, built by adding -ed.
6

eat → ate → eaten

✓ Correct — eat is irregular. Past Form (ate) and Past Participle (eaten) are different words.

7 Choose the Right Sentence

Apply What You Know

Read each question carefully. Select the sentence that matches the description.

Question 1 of 5

Select the sentence that uses Past Form correctly, standing alone with no helping verb.

B is correct. "Called" is Past Form here, standing completely alone to describe one finished past action. A uses Past Participle after "has"; C uses the -ing form after "is"; D is the passive, a different meaning altogether.

Question 2 of 5

Select the sentence that correctly uses have/has + Past Participle.

C is correct. "Go" is irregular: Base Form "go", Past Form "went", Past Participle "gone". After "has", English always needs Past Participle — "gone", not "went", "go", or "going".

Question 3 of 5

Select the sentence that correctly uses be + -ing form.

D is correct. After "is", the verb must take the -ing form — "writing". Options A, B, and C use Base Form, Past Form, and Past Participle, none of which follow "be" to build a continuous action.

Question 4 of 5

Select the sentence with the -ed / -ing spelling done correctly.

C is correct. "Stop" is a short verb ending in one vowel + one consonant, so double the "p": "stopped". Option A is missing that double letter. Option B keeps the silent "e" it should drop ("living"). Option D fails to change "y" to "i" before -ed ("carried").

Question 5 of 5

Select the sentence that correctly uses be + Past Participle to form a passive.

B is correct. The passive is built with "be + Past Participle". "Write" is irregular: Past Participle is "written", not "write", "writing", or "wrote" (which is Past Form).

8 Summary

The four forms of every verb Base Form (base), Past Form (past — stands alone), Past Participle (needs have/has/had or be), and the -ing form (needs be).

Base Form — the base form. Used for habits and after will/can/do.
Past Form — the only form that stands alone, for one finished past action.
Past Participle — never alone. Follows have/has/had, or be for the passive.
-ing form — never alone. Follows be to describe an action in progress.
Regular verbs — Past Form and Past Participle are identical, built with -ed.
Irregular verbs — must be memorized; Past Form and Past Participle are often different words.

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