1·Why do I always have a stomachache?
为什么我总是胃痛？
2·I have a stomachache.
我胃痛。
3·I have a stomachache. May I have some medicine?
我胃痛，能给我开点药吗？
4·Now I have a stomachache, and I want to have a check.
我现在胃痛，想检查一下。
5·You always have a stomachache because you don't have breakfast.
你总是胃痛是因为你不吃早饭。
6·—What's wrong with you? —I have a stomachache.
——你怎么了？ ——我胃疼。
7·You need some rest since you have a stomachache.
你胃痛，需要一些体息。
8·It is a nice kettle of fish! I have a stomachache.
这是一锅好鱼，(可惜)我胃痛。
9·Wang Hong: Aaaah, I feel sick. I have a stomachache.
王红：啊，我感觉不舒服，我肚子疼。
10·Once you have a stomachache, take the medicine twice a day.
一旦胃痛，你就吃这些药，每天两次。