***** NOT A TEACHER *****
Hello, Ms. Henderson:
1. "She wants to come." My books tell me that "to come" is an infinitive, the object of the verb "wants."
2. "Michael seemed to get a little shy." My books tell me that "seemed" is the past tense of "seem." (Compare: "Yesterday, she seemed nervous.")
3. "We can meet before the film starts." "Can" is an auxiliary verb, so the form of the verb after it is labeled the base form or the bare infinitive.
Usually (NOT always!), it is "easy" to recognize a past participle, for it follows a form of "have":
4. "I have come to help you."
5. "He had seemed fine a few minutes before his heart attack!"
6. "Had you ever met him before yesterday?"
As I said, sometimes the past participle is NOT preceded by a form of "have." Perhaps other members will discuss that topic. I will give you just two examples:
"The man was injured (by someone)." The books label "injured" as a past participle. (ONLY my opinion: I think that it comes from "Someone injured the man."
"They found [discovered] the prisoners gone." The books label "gone" as a past participle. (ONLY my opinion: I think that it comes from "They found that the prisoners had gone."
Credit for those two examples goes to Walter Kay Smart in his ENGLISH REVIEW GRAMMAR (fourth edition).
Student or Learner