Answer:

past tense:

1. choose
2. stepped
3. tossed
4. swings
5. struck
6. flies
7. landed
8. ran
9. screamed
10. slid

present tense

1. choosing
2. stepping
3. tossing
4. swinging
5. sticking
6. flying
7. landing
8. running
9. screaming
10. sliding

future tense

1. choose (simple future tense)
2. You/We/They will/shall be stepping. He/She/It will/shall have stepped, stept, or stopen. I will/shall have stepped, stept, or stopen. You/We/They will/shall have stepped, stept, or stopen.
3. I will/shall have tossed or the obsolete tost. You/We/They will/shall havetossed or the obsolete tost. He/She/It will/shall have been tossing.
4. will swing
5. strike
6. will fly
7. shall land
8. will run
9. will scream
10. will slide