救命～～～～～～～～～

homework不可数，应用little 不用few
she 的复数是they
I need some salad.我认为没有错。salad虽然是不可数名词，但可以用some修饰，比如：some water

few + 可数名词, (a) little + 不可数名词
a few / a little 为肯定含义，还有一点
few / little 为否定含义时，译为“没有多少了”。
He has a few friends. 他有几个朋友。
He has few friends. 他几乎没有朋友。
We still have a little time. 我们还有点时间。
There is little time left.几乎没剩下什么时间了。
固定搭配:
only a few (=few) not a few (=many) quite a few (=many)
many a (=many)
Many books were sold.
Many a book was sold. 卖出了许多书。
你可以参考参考

听楼上的，我搞错了，对不起……