English Grammar and Usage

Case of present perfect continuous tense. Whenever an activity of past continues till the present time, we use present perfect continuous tense. 'Has/have + been + verb+ing' is used.

To show somebody's possession, we use 'has/have'. For singular third persons we use 'has'.

Case of verb of being. To show somebody's possession, we use 'has/have'. With singular third person, 'has' is used.

Case of past indefinite. Some words like 'yesterday' always take second form of the verb.

Cae of past perfect tense. Whenever we refer to two sequential incidents of the past, we use 'had + third form of the verb' with the former.

The sentence uses the present perfect tense to describe an action that started in the past and continues to the present. 'Haven't seen' is the correct form for the first-person singular subject.

This is a general fact (present), so case of present indefinite. The blank qualifies to the apple (ie. singular noun). Therefore, we need a singular verb. Thus, option 2.

The given words mention about a fact of present times. And such cases belong to present simple tense.

Case of passive voice in present continuous tense. In such cases,we use 'is/am/are + being + third form of the verb' (loved).

Case of passive voice in simple present tense. 'Am + third form of the verb' (loved) ...... is used in such cases.

Case of active voice in present perfect tense. 'Has/have + third form of the verb' is used in such cases.

Case of passive voice in present simple tense. 'Is/am/are + third form of the verb' is used in such cases....are + loved.

Case of active voice in present simple tense. The object is missing here.

Active voice case in present continuous tense. 'Is/am/are + verb+ing' is used in such cases.

Case of passive voice in present continuous tense. 'Is/am/are + being + third form of the verb' is used in such cases.