4. We will write a composition next Monday.

【一般將來時】表示將來要發(fā)生的動作或存在的狀態(tài)。

【構(gòu)成】will +原形動詞 （主語是I, we時，可用shall）

【常用的時間短語】in the future, tomorrow, next week (month, year)

I will graduate from middle school next month.

She’ll be twenty years old next year.

—When will you be able to give us an answer?

—Tomorrow.

【注意】一般將來時還有其他表示法。

(1) be going to +不定式。如：

We’re going to put up a hospital here. 我們打算在這兒建一所醫(yī)院。

There is going to be a lot of trouble. 這件事會有許多麻煩的。

(2) be to +不定式。如：

I’m to see off Mr. Brown this afternoon. 今天下午我要去與布朗先生告別。

When are they to hand in their plan? 他們什么時候交計劃？

(3) be about to +不定式。如：

He is about to leave for Shanghai. 他就要到上海去。

5. Mary wrote a composition last night.

【一般過去時】表示過去任何一個時間發(fā)生的，或者過去經(jīng)常發(fā)生的動作或存在的狀態(tài)。

【構(gòu)成】動詞的過去式。

【常用的時間短語】last year, in 1990, yesterday, that day。凡是已經(jīng)過去了的時間都可以，包括this morning等。

I went to bed at about ten last night.

She often came to help us when she was free.

6. He was writing a composition when I got to his house.

【過去進行時】表示過去某個時間正在進行的動作。

【構(gòu)成】be (was, were) + 現(xiàn)在分詞(動詞-ing)

【常用的時間短語】this time yesterday, at ten yesterday morning, at that time, at that moment, then等。

—What were you doing at this time yesterday?

—I was writing a letter to Mr. Brown.

The UFO was traveling from east to west when he saw it.

I was reading a book when someone knocked at the door.

I found a wallet on the ground when I was walking in the street.