Answer: See explanation below
Explanation:
1.) Adverb of possibility: Possibly, Perhaps, Certainly.
Adverbs: Later, Angrily,Certainly.
Non-adverbs: Tractor, Playing, Visited
2.)a) Undoubtedly
b) Perhaps
c) Probably
d) Definitely
3.)a) Perhaps, the best way to do it would be to practice first.
b) They will probably arrive just after us.
4.) Adverbs of Possibility:
a) Probably
b) Certainly
c) Undoubtedly
d) Definitely
e) Possibly
