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know-- realize ,be aware of
need-- require
hard--challenging
should -- be supposed to
but --however,
last, -- last but not the least
I think -- In my opinion,.... From my point of view,....
晚词优先，词组优先
Ⅱ.连接词
①and,but,or, so,however(Meanwhile,Besides,)
②firstly,secondly, thirdly/finally/last but not the least
③分词（participle）过去分词（表被动）现在分词（表主动）
eg. 我是王小毛，17岁，在暑假中想参加课程
-- I am Wang Xiaomao. I am 17. I want to attend courses in the summer holiday.
-- I am Wang Xiaomao, a 17-year-old boy, hoping to attend courses during the sommer holiday.
Ⅲ.丰富句式
eg. 它很美
-- It is beautiful.
-- Its beauty attracts us a lot. It is also beyond my words/description.
eg. 我们应该解决这些问题。
--We should solve these problems.
--Ａll these problems are supposed to be solved properly.
eg. 它们是挑战。
--They are challenges.
--There is no doubt that we treat them as challenges.
eg. 村里有条河。
--There is a river in the village.
--Though the village runs a small river.
eg. 他昨天帮助了我。
--He helped me yesterday.