Fill in the Blanks

Case of present perfect tense. In such cases we use 'has/have + third form of the verb'.

Case of past indefinite tense. Option 1 is the correct usage (second form of the verb).

This is a general statement of fact (present tense). In such cases, we use the first form of the verb.

This is a statement of a fact (present tense). In such cases, we use the first form of the verb. Rarely comes is the correct verb usage. Hence, option 1 is correct.

Case of future indefinite tense. We use the indefnite form of the verb(explain). Hence, option 1 is correct.

Whenever two incidents are to happen in the future in a sequence, we use present tense form for the former incident. Hence, option 1 is correct.

'Since' suggests 'she became unconscious at 4 'o' clock and is still unconscious'. Hence, we use 'has been unconscious'.

Whenever we refer to a specific time of the past (as last week in the sentence), we use past indefinite tense.

Case of present perfect continuous tense. Hence, option 1 is correct.

Case of present perfect tense. We use 'have/has+ third form of verb'. Hence, option 2 is correct. 

Case of present perfect tense. Hence, option 1 is correct.

To refer to specific time of the past, we use past indefinite tense (i.e. second form of the verb). Hence, option 1 is correct. 

Case of present perfect continuous tense. Hence, option 3 is correct.

Case of present perfect tense. We use'has/have+ third form of verb'.

The sentence implies 'It started raining in the morning and is still raining'. Hence, we use 'has/have + been + verb+ing'. Hence, option 3 is correct.