I think it is useful for us to help other people.改为一般疑问句是快乐暑假江苏盐城8年级英语练习七

i think It (is) useful to learn english well.括号里面的is要不要加? I think it useful a_____,so I will take it. 填冠词.2.This is a useful dictionary,I think.So it is,and it's( ) unusual one. 英语.i find it useful.为什么不加is换成i think 的话用加is吗? I don't know who invented the machine,but I think it is a/the useful invention.a还是the? I don't think it is useful for me to finish the task ----?A can it B is it C can't it D isn't it 为什么 I think it's a.useful job.翻译 I think it's useful for the environment. to learn a foreign language well is useful,I think(改为同义句)I think it useful to learn a foreign language well .这里的第二句话中为什么用it而不是it's I think——（this,that,it）is very useful to learn english well.填那个, I think——（this,that,it）is very useful to learn english well.填那个, I think it is one of the most useful ______(dictionary)请问这个dictionary要加s吗? what do you think of the English training center is useful for you?I need some suggestion about it/ English is very useful l ,I think要快! i think English is most useful of all the subjects. It is ____ useful book.I borrowed it yesterday. I have tired it,but it is still ＿(useful). i think science is more useful than art.--i disagree,i think art is--science.a.more useful asb.less useful than c.the most useful of d.as useful as请说明原因