'Did you see them go' and 'did you seem them going' are both correct. Some verbs can take the bare infinitive (no ' to ') as object, some can take the -ing form as object, some can take either and some can take neither.
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Mister Micawber'Did you see them go' and 'did you seem them going' are both correct. Some verbs can take the bare infinitive (no 'to') as object, some can take the -ing form as object, some can take either and some can take neither.MM, thank you for the reply. But the the object of the verb to see is "students".