帮忙几道改错题
1.For you are free tonight ,why not drop in and play chess with me
2.If only the caculation is right,scientist can never be sure that thay have included all variables and modeled them accurately.
3.however difficult is english ,i will learn it well.
4.this old school is still having the same number of students when it had a hundred ears ago when it was first founded.
5.much although he likes her ,he does get irritated with her sometimes
6.earthworms exit there adequate moisture and food and necessary soil condition are found