We can use either the infinitive without "to" or the "-ing" form after the object of verbs such as hear, see, notice, watch. The infinitive without "to" often emphasises the whole action or event, which someone hears or sees. The "-ing" form usually emphasises an action or event, which is in progress or not yet completed.
Example:
Jason saw a young man rode off with his girlfriend on the pillion. | The speaker observed the whole event. |
I heard him singing in the bathroom, when I walked in to the house. | The action was in progress, but not completed. |
The -ing form can also emphasise that an event or action is repeated.
Example:
We watched the movers moving back and forth, taking boxes out of the house and loading the truck.
After can or could with one of these verbs, we always use the -ing form, not the infinitive.
Example:
I can hear people laughing. They must be in the next room.
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