1.首先這句話是“never”開頭,你要記住否定式開頭要的話句子要用倒裝結(jié)構(gòu),由此排除A、C,另外never before 暗示是現(xiàn)在完成時(shí),所以是have I been to
2.關(guān)于過(guò)去分詞和被動(dòng)語(yǔ)態(tài)的區(qū)分,如果有be動(dòng)詞的話,也就是am,is ．a(chǎn)re及他們的過(guò)去式,有的話就是被動(dòng)語(yǔ)態(tài),沒(méi)有的話過(guò)去分詞就是做定于的,比如“a folded chair”和“the chair is folded．”
3.the students were divided into several groups to discuss the topic
首先看一下這個(gè)句子的結(jié)構(gòu),你要記住一句話只能有一個(gè)謂語(yǔ)動(dòng)詞,請(qǐng)注意我說(shuō)的是謂語(yǔ)動(dòng)詞,就是這個(gè)動(dòng)詞是做謂語(yǔ)的,這句話中,謂語(yǔ)動(dòng)詞是were,它被用在了被動(dòng)語(yǔ)態(tài)中,組成詞組"were divided into",所以后面的discuss 就不能用原形了,而要用不定式to discuss.
綜上,你要加強(qiáng)的語(yǔ)法點(diǎn)是：倒裝句型和非謂語(yǔ)