I am wondering how to discern the following sentences:
I had two players guarding Mark. / I had two players guard Mark.
As far as I know, causative verbs usually have bare verbs after the object of them like in "I had him call me back, She made me cry, or They let me go." Then why sometimes ,"have" is followed by ---ing form right after the object of it.
I would appreciate it if any of you help me out with this confusing matter.
I am not a teacher, but I am a native speaker.
Your perception is correct; causative verbs usually have bare verbs after them.
"I had two players guard Mark" - This sentence indicates that you took action that caused the two players to guard him. For example, you might say "Mark scored a goal, so I had two players guard him."
The -ing form indicates something different:
"I had two players guarding Mark" - It indicates how things were at the time. "I had two players guarding Mark when he scored a goal." The players were guarding him. I don't know of any verbs except "had" that can use this.
It is confusing, but I hope I have helped you.