Subject-verb agreement : - Subject-verb agreement is the grammatical rule that the verb or verbs in a sentence must match the number, person, and gender of the subject; in English, the verb needs to match just the number and sometimes the person . Subject-verb agreement, also called “subject-verb concord,” refers to matching the subject and verb of a sentence in tense, aspect, and mood (abbreviated as TAM), which translates to number, person, and gender.

Usage of Modals in Subject Verb Agreement:

Modal verbs (will, would, should, may, can, could, might, must) precede another verb. Modals do not change their form to agree with the subject.

• When they occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped.

Remember that modal with auxiliary verbs do not have a different third-person form ending is s:

• She can sit beside me.

In the question : -

1. Jimmy could packs his lunch for work.

The correct form of the above sentence is :

Jimmy could pack his lunch for work. 

In this sentence , when modal verb can occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped. So we use only pack here . Remember that modal with auxiliary verbs do not have a different third-person form ending is s .

2. I ought to learn more grammar.

The correct form of the above sentence is :

I ought to learn more grammar.  

In this sentence , Ought and used do not change the form, but they are always used with a to-infinitive .

Thus , the Correct Option is C , which is 1. Jimmy could pack his lunch for work. 2. I ought to learn more grammar.

Subject-verb agreement : - Subject-verb agreement is the grammatical rule that the verb or verbs in a sentence must match the number, person, and gender of the subject; in English, the verb needs to match just the number and sometimes the person . Subject-verb agreement, also called “subject-verb concord,” refers to matching the subject and verb of a sentence in tense, aspect, and mood (abbreviated as TAM), which translates to number, person, and gender.

Usage of Modals in Subject Verb Agreement:

Modal verbs (will, would, should, may, can, could, might, must) precede another verb. Modals do not change their form to agree with the subject.

• When they occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped.

Remember that modal with auxiliary verbs do not have a different third-person form ending is s:

• She can sit beside me.

In the question : -

1. My classmates could ____________ a lot harder.

In this sentence , when modal verb can occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped. So we use only study here . Remember that modal with auxiliary verbs do not have a different third-person form ending is s .

2. I will not ____________ food today.

In this sentence , when modal verb can occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped. So we use only have here . Remember that modal with auxiliary verbs do not have a different third-person form ending is s .

3. He will ___________ to the party. In this sentence , when modal verb can occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped. So we use only go here . Remember that modal with auxiliary verbs do not have a different third-person form ending is s .

Thus , the Correct Option is D , which is 1. Study 2. Have 3. Go .

Subject-verb agreement : - Subject-verb agreement is the grammatical rule that the verb or verbs in a sentence must match the number, person, and gender of the subject; in English, the verb needs to match just the number and sometimes the person . Subject-verb agreement, also called “subject-verb concord,” refers to matching the subject and verb of a sentence in tense, aspect, and mood (abbreviated as TAM), which translates to number, person, and gender.

Usage of Modals in Subject Verb Agreement:

Modal verbs (will, would, should, may, can, could, might, must) precede another verb. Modals do not change their form to agree with the subject.

• When they occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped.

Remember that modal with auxiliary verbs do not have a different third-person form ending is s:

• She can sit beside me.

In the question : -

1. He cans play the flute.

The correct form of the above sentence is :

He can play the flute.

In this sentence , when modal verb can occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped. So we use only can here . Remember that modal with auxiliary verbs do not have a different third-person form ending is s .

2. You musts leave before noon tomorrow.

The correct form of the above sentence is :

You must leave before noon tomorrow.

In this sentence , when modal verb can occur with a verb, the third person -s in the present tense and the -ed in the past tense of the verb are both dropped. So we use only must here . Remember that modal with auxiliary verbs do not have a different third-person form ending is s .

Thus , the Correct Option is A , which is 1. He can play the flute. 2. You must leave before noon tomorrow.