Unit 5 First aid教案
be about to do...when... 剛要做……突然……
be on the point of doing sth. when... 剛要做……突然……
高手過招
單項(xiàng)填空
①she had just finished her homework her mother asked her to practice playing the piano yesterday.
（•福建）
a. when b. while c. after d. since
②we were swimming in the lake suddenly the storm started.
a. when b. while c. until d. before
③i along the street looking for a place to park when the accident .
a. went; was occurring b. went; occurred
c. was going; occurred d. was going; had occurred
解析: ①選a。由句意可知此處when用作并列連詞，意為“這時(shí)”。②選a。when作連詞，表示“正在這時(shí)”。句意為：我們正在湖中游泳，突然暴風(fēng)雨來了。③選c。主句要用過去進(jìn)行時(shí),表示當(dāng)時(shí)正在路上走著；when引導(dǎo)的從句多用一般過去時(shí)。