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therefore的用法詳解
therefore有兩種用法,一在整句中,一在分句中。
一、整句中時一般不放句末,句首后要有逗號,句中1、按一般副詞使用2、做插入語(這兩個分得清吧)
eg.1、Therefore,we must learn English well.
2、They therefore can learn English well.
3、Many fast food restaurant ,therefore,have red furniture or walls.
二、用在分句中,即一個句子一部分表示原因一部分表示結果。
這時一般詞前要用分號,其后用不用逗號無所謂。若第二個分句前是逗號或無符號,則要注意therefore是副詞,和so不一樣,要保持句子完整,應用and therefore。
eg.1、I had a headache;therefore I could not go to your party.
2、I was ill,and therefore could not come.
3、These birds are very beautiful and therefore liked by many people.
注:therefore是副詞,但有時具有連詞作用
therefore,otherwise 和 thus 的區(qū)別
Therefore要加逗號,后面跟句子(注意是句子);
Thus不一定要加逗號,后面不一定跟句子。
I was helping my sister with her study.Therefore,I failed to pass the exam.
Air carry the virus to everywhere,thus causing the explosion of the disease.(無逗號,thus 后面不是句子)
Air carry the virus to everywhere.Thus,it causes the explosion of the disease.(逗號,thus 后面是句子)
用于句型“祈使句+or+陳述句”中,表示在以祈使句為條件下的相反假設,意為“否則,要不然”。
例如: Work hard,or you will fall behind.你要努力學習,否則會落后。
Get up early tomorrow,or you will miss the early train.你明天要早點起身,要不然就趕不上早班火車了。
Don't jump the queue,or other peopoe will not be pleased.別插隊,否則別人會不高興的。
可以把這類句型中的祈使句換為一個條件句(注意改寫時應去掉連詞or)。
例如: Hurry up,or you will be late for the meeting.→If you don't hurry up,you will be late for the meeting.
otherwise 用作連詞,意思為“否則;要不然”,相當于 or,or else 或 if not .
例如: We’ll go early,otherwise we may not get a seat. 我們得早點去,要不然就沒有座位了。
Seize the chance,otherwise you will regret it. 抓住機會,要不然你會后悔的。
I was ill that day,otherwise I would have taken part in the sports meet. 那天我病了,否則我會去參加運動會的。
We didn’t know you were in trouble at that time,otherwise we would have given you a hand. 我們當時不知道你遇到了困難,要不然我們會幫助你的
because、for、therefore作“因為”講的區(qū)別
for ,because,as,since這四個詞作為連詞,都有"因為"的意思,但它們在用法上有區(qū)別:
because 是從屬連詞,接表示直接原因的從句,一般放在主句的后面,也可放在主句前面,它表示的語氣最強,在回答why的問句時,必須用because。
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