Now, complete these rules! 1. We use + past participle to say that an event or situation was possible in the past.

2. We use + past participle to say we are sure something didn't happen or was impossible in the past.

3. We use + past participle to say we are sure that something happened or was true in the past.

Type the correct answer in the box. spell all words correctly. certain species of insects introduced accidentally in a forest are destroying all the douglas fir trees in that forest. the wood of these trees is extensively used for construction. in order to control the damage caused by these insects, the forestry department decided to introduce the moth caterpillar in the forest. these caterpillars are natural predators of the insects. which method did the forestry department implement to control the invasive species? the forestry department implemented a(n) control method.