Help the wildlife photographer finish his field notes by choosing the correct verbs to complete the funny story.

I was hiding in the bushes when I noticed a large, fluffy bear trying to sneakily open a camper's picnic basket. A few minutes later, I observed the clumsy animal trip over a fallen log and roll all the way down the hill.

I was hiding in the bushes when I noticed a large, fluffy bear trying to sneakily open a camper's picnic basket.

When you catch someone (or a bear!) in the middle of doing something, use a verb of perception (like notice) followed by the -ing form. The bear was already in the process of trying to open the basket when the photographer noticed.

A few minutes later, I observed the clumsy animal trip over a fallen log and roll all the way down the hill.

For a quick action that you witness from beginning to end, use the bare infinitive. The bear tripped and rolled as one complete, unfortunate sequence of events!