"My doughter isn't feeling well" 这句里为什么不用isn't 而不用doesn't? 走遍美国的一个例句

因为后面跟着的是名词的ing形式,feeling。 动名词前面只能用be动词，而不能用do/does.

如果用dosen't这句话应该改成: my daughter doesn't feel well.

feel是系动词，TX