Page 11 - KSSR ENGLISH GRAMMAR WHIZZ 英文语法小专家

Grammar Whizz Unit 20 The Present Perfect Tense

The present perfect tense is used:
现在完成时式用于：
(i) for an action that has happened, but the time that it happened is
not known. Thus, it is often used with the adverb ‘already’.
指已经发生但时间不详的动作，因此常与副词“already（已经）”
连用。

Albert has already seen my collection of postcards.
英文语法小专家, 版权所有·侵权必究
The cat has caught a mouse.
The girls have forgotten to bring along their dictionaries.
We have already done the jigsaw puzzle.

(ii) to show that an action started in the past and continued into the
present. It is often used with adverbs like ‘since’ (to show when
the action started) and ‘for’ (to show the length of time).
表示由过去开始一直持续到现在的动作，常与副词“since”
（从…以来，表示动作何时开始）及“for”（表示一段时间）
连用。

Mr Tan has lived in this housing area since 1985.
He has watched TV since 9 o’clock this morning.
My uncles have worked as doctors for eight years.
The children have played with the building blocks for an hour.

(iii) to show that an action has just been completed. Therefore, it is
often used with the adverb ‘just’.
表示刚完成的动作，常与副词“just（刚刚）”连用。

He has just taken his bath.
Miss Lu has just toured China.
My parents have just returned from overseas.
The pupils have just sung the national anthem.

PB 111

020 Grammar Whizz_p110-114.indd 111 3/15/19 11:06 AM