现在进行时的基本用法:
a. 表示现在( 指说话人说话时) 正在发生的事情。
例句:We are waiting for you.
b. 习惯进行:表示长期的或重复性的动作,说话时动作未必正在进行。
例句:
Mr. Green is writing another novel.
(说话时并未在写,只处于写作的状态。)
She is learning piano under Mr. Smith.
c. 表示渐变的动词有:get、grow、become、turn、run、go、begin等。
例句:
The leaves are turning red.
It's getting warmer and warmer.
d. 与always, constantly, forever 等词连用,表示反复发生的动作或持续存在的状态,往往带有说话人的主观色彩。
例句:You are always changing your mind.
例题:
My dictionary ______, I have looked for it everywhere but still______ it.
A. has lost, don't find;B. is missing, don't find;
C. has lost, haven't found;D. is missing, haven't found;
答案:D。
解析:前句是一个仍在持续的状态,应用进行时,由于没有找到,其影响仍然存在,应用完成时,瞬间动词用于否定式时可用于完成时。