問英文,關於infinitive~

make somebody do something,
see somebody do something,
hear somebody do something,
etc.
裏面個"do "係咪一定要係現在式~?遇到第三人稱又洗唔洗加s?
可唔可以舉個例子?

have somebody do something
裏面個"do "又係咪一定要係現在式~?遇到第三人稱又洗唔洗加s?
可唔可以舉個例子?

同埋 ,
try to do同try doing something 用法係點~?有咩唔同~?