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She thinks it’s fantastic.
—你决定写哪本书了吗?
—是的,决定了。
我已经看完了。书真的很好。
—Have you decided which book to write about yet?
—Yes, I have.
I’ve already finished reading it. It was really good.
现在完成时的构成
现在完成时由“助动词have / has +?动词的过去分词”构成。其中,动词过去分词的构成有规则构成和不规则构成两类。规则动词过去分词的构成和其过去式的构成相同,如:finish→finished;live→lived; stop→stopped; study→studied等。不规则动词的过去分词需要大家牢记。参见课本P136—137。
现在完成时的用法
现在完成时可表示过去发生或已经完成的动作对现在造成的影响或结果。如:
I have lost my pen. (我现在无钢笔可用)
He has had a good education. (他的文化水平比较高)
现在完成时的标志词
现在完成时常与already, yet, ever, never, before, just等连用。其中, already常用于肯定句中, yet常用于否定句和疑问句中。含有already的肯定句变否定句或疑问句时, 要将already变为yet, 并置于句末。如:
The rain has already stopped. →
The rain hasn’t stopped yet. →
Has the rain stopped yet?
现在完成时肯定句变否定句、一般疑问句及一般疑问句的简略回答
现在完成时的肯定句变否定句时, 是在have / has后加not, 可缩写为haven’t / hasn’t; 变一般疑问句时, 是把have / has提至主语前, 一般疑问句的简略回答为“Yes,?主语(人称代词) + have / has.”和“No,?主语(人称代词) + haven’t / hasn’t.”。如:
I have got a letter from my aunt.? (肯定句)
→I haven’t got a letter from my
aunt.? (否定句)
→—Have you got a letter from your
aunt?? (一般疑问句)
—Yes, I have. / No, I haven’t. (简
略回答)
根据括号内的要求完成下列各题。
1. Tom has already finished his homework. (改为否定句)
Tom hasn't finished his homework yet.?