He has to see doctor because he________(胃疼）.帮帮忙,是 stomachache 还是 has a stomachache ,帮忙分辨分辨

He has to see doctor because he________(胃疼）.帮帮忙,
是 stomachache 还是 has a stomachache ,帮忙分辨分辨

是 has a stomachache
stomachache 是名词,表示“胃痛,肚子痛”,在句中不能作谓语动词,所以用has a stomachache.

has a stomachache

has a stomachache
是一个词组 stomachache是一个名词