1.He has a stomachache.
= There（is pain/ache in）his stomach.
= There（is trouble with）his stomach.
2.Mother stopped me from flying a kite.
= Mother（told/asked/ordered）me（not to fly）a kite.
3.He didn't fall asleep until his mother came back last night.
= He（fell）asleep (after) his mother came back last night.
注：/表示可以任意选用其一.