1. Have/has.
Look at these sentences from the text in READING:
1. Scientists who have studied the issue ...
2. It was presumed to have become extinct ...Have in sentence 1 is the auxiliary verb in a present perfect verb phrase.
Have in sentence 2 is part of a perfect infinitive: (to) have + past participle.
Look at these examples of have/has from the text. Put them into two groups.
For more information about the perfect infinitive see the Grammar Reference.
2. Expressing possibility.
What other words can you substitute for may in this sentence, so that the meaning is more or less the same?
Sasquatch could be a surviving form of giant apes that may have crossed from Asia to America.
Match the sentences on the left with the sentences on the right that mean the same.
For more information about expressing possibility see the Grammar Reference.
4. Expressing possibility.
Complete the dialogue by rewriting B's sentences using the verb in brackets. Remember to include punctuation.
5. Reporting: reported seeing.
Eyewitnesses report seeing a giant ape.
Other reporting verbs that follow the pattern verb + -ing are:
describe
remember
recall
mention
deny
admit
Write sentences in the present tense using this pattern.
For example:
"I stole the money." (he/admit)
He admits stealing the money.
6. Verb + noun + -ing.
They saw something walking in the forest.
Scientists photographed an animal swimming underwater.
Other verbs that follow this pattern are:
feel
find
hear
notice
observe
watch
Combine the two sentences to make one sentence.
For example:
They saw something. It was walking in the forest.
8. See something do vs. see something doing.
1. She saw the animal climb a tree.
2. She saw the animal climbing a tree.
In sentence 1, she saw the complete action from start to finish.
In sentence 2, she saw the action in progress, but not necessarily
all of it.
Match the sentences with the pictures.
9. Since then.
Look at these examples of since then in the text. What does then refer to, in each case? (You can refer back to the text.)