Verbs : These are words that refer to an action or a state of being. A sentence must have a verb or else it is incomplete. Along with nouns, verbs are the main part of a sentence or phrase, telling a story about what is taking place. In fact, without a verb, full thoughts can’t be properly conveyed, and even the simplest sentences, such as Maria sings, have one. Actually, a verb can be a sentence by itself, with the subject, in most case you, implied, such as, Sing! and Drive!

Example : She eats chocolate cake on Sundays . Here , eats is a verb as it tells about the action performed by noun or pronoun .

Verbs take different forms according to the tense. The present tense form of the verb is called the base form.

Regular Verbs : - Verbs in the past tense and past participle form take an - ed or -en or -t. Such verbs, with the suffix  -ed, -en or -t are called regular verbs.

For Example : - I advised you to slow down. Here , advised is a regular verb as it ends with ed .

Irregular Verbs : - Verbs that do not have -ed, -en or -t as suffix in their past and past participle form are called irregular or strong verbs. catch and go have their past forms as caught and went and not the usual -ed or -en or -t in their past tense forms.

For Example: You should have seen Akash’s face when she got him surprise. Here , seen is a irregular verb as it has different past participle form . Seen is the third form of main verb see .

In the question

1. I ___________ the trees on my way home . In this sentence , the correct form of verb that can be placed in the blank part is noticed as it is a regular form of verb and ends with ed . noticed is the past participle form of notice .

2. I ____________ a pencil to do my homework . In this sentence , the correct form of verb that can be placed in the blank part is used as as it is a regular form of verb and ends with ed . used is the past participle form of use .

3. He had __________ to his friend.  In this sentence , the correct form of verb that can be placed in the blank part is shouted as it is a regular form of verb and ends with ed . shouted is the past participle form of shout .

Thus , the Correct Option is B , which is noticed , used , shouted .

Verbs : These are words that refer to an action or a state of being. A sentence must have a verb or else it is incomplete.

Irregular Verbs : - Verbs that do not have -ed, -en or -t as suffix in their past and past participle form are called irregular or strong verbs.

For Example: You should have seen Akash’s face when she got him surprise.

Here , seen is a irregular verb as it has different past participle form . Seen is the third form of main verb see.

In the Question:-

We ___all night. 

 In this Question the correct irregular verb  that can be used is Sang as Sang  (sing) do not have -ed, -en or -t as suffix in its past and past participle form .Sang  is the second form of main verb sing. Sung is used in sentence in line as sentence is in past thus SUNG (Past form of sing ) is used.

Thus, the correct option is C, which is Sang.

Verbs : - These are words that refer to an action or a state of being. A sentence must have a verb or else it is incomplete. Along with nouns, verbs are the main part of a sentence or phrase, telling a story about what is taking place. In fact, without a verb, full thoughts can’t be properly conveyed, and even the simplest sentences, such as Maria sings, have one. Actually, a verb can be a sentence by itself, with the subject, in most case you, implied, such as, Sing! and Drive!

Example : She eats chocolate cake on Sundays . Here , eats is a verb as it tells about the action performed by noun or pronoun .

Regular Verbs : - Verbs in the past tense and past participle form take an - ed or -en or -t. Such verbs, with the suffix  -ed, -en or -t are called regular verbs.

For Example : - I advised you to slow down. Here , advised is a regular verb as it ends with ed .

Irregular Verbs : - Verbs that do not have -ed, -en or -t as suffix in their past and past participle form are called irregular or strong verbs. catch and go have their past forms as caught and went and not the usual -ed or -en or -t in their past tense forms.

For Example: You should have seen Akash’s face when she got him surprise. Here , seen is a irregular verb as it has different past participle form . Seen is the third form of main verb see .

In the question

1. She spoke too softly. I couldn't ______________ her. In this sentence , the correct form of verb that can be placed in the blank part is hear as it is the regular form of verb and ends with ed . Hear is the first form of hear .

2. I accidentally _____________ the document I was working on. In this sentence , the correct form of verb that can be placed in the blank part is closed as it is the regular form of verb and ends with ed . Closed is the third from of verb close .

Thus , the Correct Option is A , which is 1. hear 2. closed .