【正文】
off?進行時表將來 4. She struggled and struggled, and could not get on her feet. (= keep struggling) 5. You should not go rafting unless you know... unless引導(dǎo)條件狀語從句,相當(dāng)于if... not 6. By staying at..., tourists can help the villagers make money so that they can take care of the fiver and the 7. She was so surprised that she couldn’t 8. Tree after tree went down, cut down by 9. The next moment, the first wave swept her down, swallowing the 10. However, before she could think twice, the water was upon her. It didn’t take long before the building was destroyed. before的用法 介詞又叫前置詞,是一種虛詞。 介詞分為三種,一種是簡單介詞,如 at, in, on, beside, to , for 等。另一種是短語介詞,即由兩個以上的詞組組成的短語,in front of, because of, out of, instead 如 of 等。還有一種二重介詞,如 until after, from behind 等?! 〗樵~的句法功能:介詞不能獨立在句中做成份,介詞后必須與名詞、代詞、或動名詞構(gòu)成介詞短語在句中充當(dāng) 一個成份,表示人、物、事件等與其它人、物、事件等之間的關(guān)系?! ?作定語: The book on the table