托福考试中的语法部分经常会有一些不显眼的意思相近小词作为考点，归纳一下考前必浏览一下的几个小词组群，必会让你事半功倍。

like / as 来源：考试大

like  是介系词，必须接名词。
as  是连接词，必须接子句。
She sings  like an angel.
She sings  as an angel does.

due to / because of / because / for / since / as

due to   接受词，通常放在 be  动词之后。
His absence was  due to  illness.
because of  因为有介系词，必须接受词。
He canceled his reservation  because of  his cold.
because  作连接词，叙述理由，要接子句。
I don ’ t go to school  because  I had a bad headache.
for  作连接词，推测前句的理由，要接子句，但不能放在句首。
He was glad to go,  for  his grandmother had been good to him.
since  是连接词，语意没有 because  那么强，置于句首。
Since you are going to go to the post office, would you mail this letter ?  （既然你要去邮局，可以帮我寄这封信吗？）
as   作连接词，语意比 since  更弱。
As it was getting dark, we made for home.

compare  to / compare  with 来源：考试大

compare to （比喻、比作），作抽象事物之间的比较，而 compare with   则作一般事物的比较。
I should  compare  your eyes  to  diamonds.
我应该把你的眼睛比喻成钻石。
We can ’ t  compare  diamond  with  jade.
我们无法比较钻石和翡翠。

imply / infer 来源：考试大

imply  是暗示、暗寓的意思 ， infer   则是由暗示、暗寓来推测结论。
The guest speaker  implied  that the scholar ’ s theory was wrong.
The fact may be  inferred  from his words.

watch / look / see

watch  是看着动态的景物， look  是看着静态的景物， see  则广义地用于看见人或物
I am  watching  a baseball game/TV.
Look  at the picture on the wall.
I can  see  some roses in the vast.

scarcely /rarely /seldom / seldom, if ever / hardly ever

scarcely, rarely, seldom  和 hardly   放在句首时，主词和 be  动词或助动词要倒装。
seldom  和 rarely   是“很少”的意思，通常置于动词之前。
She had  seldom [or rarely]  written to her friend.
seldom if ever 和   hardly ever  是副词片语，意思皆为“几乎不… . ”。
He  seldom,   if ever,  drinks.
He  hardly   ever  drinks.

kind of来源：考试大 

this kind of  +  单数名词   =  these kind of +  复数名词，都指只有一个种类。 these kinds of  才指有很多种类
This kind of man  is dangerous. =  These kind of men  are dangerous. （这种人很危险。）
These kinds of  trees are easy to grow. （这些品种的树很容易长。）

by / till

by  表示未来将完成的某一时间界限。
—— ｜——————｜————  I will finish my paper  by  tomorrow.
    现在          完成的时点
till   是表继续动作的终点
∨               ∨
ˉˉˉˉˉˉˉˉˉˉ继续ˉˉˉˉˉˉˉˉˉˉˉˉˉˉ  I will be here  till  tomorrow.
    现在——————→
                    线段终点

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