Answer :
For the first one the complete subject is The young boy. The simple subject is boy
Answer:
1.Simple subject=boy complete subject=the young boy
2.Simple subject=Mrs.Hill complete subject=My teacher Mrs.Hill
3.SS=children CS=THe two playful children
4.SS=Ana CS=My sister's friend Ana
5.SS=dog CS=The friendly dog
6.Simple predicate=walked Complete predicate=walked to the park
7.SP=collects CP=collects old stamps
8.SP=cooked CP=cooked a delicious dinner
9.SP=works CP=works hard all day
10.SP=hopped CP=hopped away quickly
Explanation: