Question

I________for half an hour when it
suddenly started to rain(had been walking,have walked,had been walking,walk)​

Answer 1

Answer:

I had been walking for half an hour when it suddenly started to rain

Explanation:

Had been is analogous to have been and has been, except that it identifies actions that both began and led to the past. It's used in the past perfect and past perfect continuous tenses. once we are talking about the past: for any subject (I, You, He, She,It, We, They) we use 'had been'. “Had been,”, suggests an action that both began and led to the past. We use the past perfect tense continuous to indicate that something started in the past and continued up until another time in the past. Without getting too technical about it, there are two major differences: “Had been” is employed to mean that something happened in the past and has already ended. “Have been” and “has been” are wont to mean that something began in the past and has lasted into the present time.

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Answer 2

Answer:

I had been walking for half an hour when it suddenly started raining.

Explanation:

• Tense,  an important concept in Grammar, is the time of a verb's action or its state of being. Tense annotates the verb with a time reference.
• For example, I am eating ( Present Continuous), I ate (Past Tense), I had been eating ( Past Perfect Tense)
• The three basic types of Tenses are: Present Tense, Past Tense, Future Tense.

Present Tense - Annotates the action that is happening currently ( I eat)

Past Tense  - Annotates the action that has happened ( I ate )

Future Tense - Annotates the action that will happen ( I will eat )

Considering the given sentence,

I had been walking for half an hour when it suddenly started raining.

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