答：1. 強調句是有過去時/式形式的。例如：
It was last night that we held an English party.
陳述句：Mr. Smith is leaving for Hongkong tomorrow morning.
強調句：It is Mr. Smith that/ who is leaving for Hongkong tomorrow morning. ( 強調主語)
陳述句：John went to visit the Great Wall last summer.
強調句： It was last summer that John went to visit the Great Wall.
陳述句：Mike and Bill often help me with my math.
強調句：It is Mike and Bill that/ who often help me with my math.
陳述句： We worked on the farm a few days ago.
強調句： It was a few days ago that we worked on the farm.
答：1. 強調句是有過去時/式形式的。例如：
It was last night that we held an English party.
一般來說，在強調句型結構中，為了強調句子（陳述句）的某一成分（通常是主語、賓語或者狀語），常用強調結構：It is/ was+被強調部分+that/ who-從句。如果陳述句的謂語動詞時態是一般現在時或一般將來時，就用“It is ... that/ who...”這個強調句型結構。例如：陳述句：Mr. Smith is leaving for Hongkong tomorrow morning.
強調句：It is Mr. Smith that/ who is leaving for Hongkong tomorrow morning. ( 強調主語)
如果陳述句的謂語動詞的時態是表示過去意義的各種時態時，則要用“It was...that/ who... ”這個強調句型結構。例如：陳述句：John went to visit the Great Wall last summer.
強調句： It was last summer that John went to visit the Great Wall.
在強調句型中，即使被強調的主語是複數，主句中的謂語動詞也仍然是用l單數。總之，在it後面只能用is/ was. 倒如：陳述句：Mike and Bill often help me with my math.
強調句：It is Mike and Bill that/ who often help me with my math.
在強調時間、地點原因或方式狀語時，不要用when, where, how, 而一律用that來引導句子。例如：陳述句： We worked on the farm a few days ago.
強調句： It was a few days ago that we worked on the farm.