11.24 一般现在时代替完成时
1)有些动词用一般现在时代替完成时:hear,tell,learn,write,understand,forget,know,find,say,remember.
I hear(= have heard)he will go to London.
I forget(=have forgotten)how old he is.
2)句型:It is … since…代替It has been … since …
3)It is(= has been)five years since we last met.