Complete the sentences with the verbs in the correct form. 1) Kate was tired because she (write) a test for a long time.
2) John (wash) his car when the rain (start).
3) I (sleep) before my maths exam last week because I (revise).
4) Wendy (cook) since morning before her guests (arrive).

1) Kate was tired because she had been writing a test for a long time.

Explanation:
In this sentence, we use the past perfect progressive tense ("had been writing") to show that Kate had been doing the action of writing the test for a period of time before she felt tired. This tense is formed by using the helping verb "had" in the past tense, followed by "been" and the present participle form of the main verb (write). This tells us that the action of writing the test started in the past and continued until a specific point in the past (when Kate became tired).

2) John was washing his car when the rain started.

Explanation:
In this sentence, we use the past progressive tense ("was washing") to show the ongoing action of John washing his car. This tense is formed by using the helping verb "was" in the past tense, followed by the present participle form of the main verb (wash). The action of washing the car started in the past and was still happening when the rain started.

3) I had slept before my maths exam last week because I was revising.

Explanation:
In this sentence, we use the past perfect tense ("had slept") to show that the action of sleeping happened before another past action (my maths exam). This tense is formed by using the helping verb "had" in the past tense, followed by the past participle form of the main verb (sleep). The action of sleeping happened before the specific point in the past when the maths exam took place.

Additionally, we use the past progressive tense ("was revising") to show the ongoing action of revising. This tense is formed by using the helping verb "was" in the past tense, followed by the present participle form of the main verb (revise). The action of revising was happening at a specific point in the past (before the maths exam).

4) Wendy had been cooking since morning before her guests arrived.

Explanation:
In this sentence, we use the past perfect progressive tense ("had been cooking") to show that Wendy had been doing the action of cooking continuously for a period of time before her guests arrived. This tense is formed by using the helping verb "had" in the past tense, followed by "been" and the present participle form of the main verb (cook). It tells us that the action of cooking started in the past and continued until a specific point in the past (when the guests arrived).