1.be useful to_ 2.be helpful to3.be important to4.be necessary to填doing或do

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1.be useful to_______ 2.be helpful to______3.be important to______4.be necessary to______填doing或do
1.be useful to_______ 2.be helpful to______3.be important to______4.be necessary to______
填doing或do

1.be useful to_______ 2.be helpful to______3.be important to______4.be necessary to______填doing或do
be useful to do sth
it is helpful to do sth.做……是有好处的
It is helpful for sb.to do sth.某人做……是对他有好处的
这两个都是it 做形式主语
helpful 是表示“有好处”,而不是“有助的”
it is helpful in doing sth.
sth.is helpful to sth./ doing sth.前面的sth.一般是具体的某个事物
be important to do sth ,be important for sb to do sth
be necessary to do sth

write

think

sleep

study

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It's useful \helpful \ important \necessary to do sth

在这个句型中通常是to do

希望对你有帮助，满意请采纳不对吧，我记得be helpful to doing sth在上面句型中是to do 在下面短语中可以出现doing，不过doing是动名词，不...

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It's useful \helpful \ important \necessary to do sth

在这个句型中通常是to do

希望对你有帮助，满意请采纳

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1.be useful to_______ 2.be helpful to______3.be important to______4.be necessary to______填doing或do be useful是什么意思 be more useful是什么意思 1.Its better to give than to______ be useful to和be useful for的区别 be useful to和be useful for的区别? be useful for=什么? Fire can be very useful useful, useful be useful to sb还是for sb? 请问be useful for sb是不是短语 be useful to的中文解释 these ways seem to be useful useful前一定要加be动词吗 We should be friendly and helpful to______.(用other的适当形式填空）是be useful for 还是be useful to?对……有用的 be useful to do sth 与be useful in doing sth的区别最好带有例句.