—Has he finished white-washing the fence?

—I ________ (not think) because I saw him working at it two minutes ago.

What is the difference between the infinitive marker to and the preposition to? Give one example for each.

Combining the two sentences by using a cohesive device:

Oklahoma became a state in 1907. New Mexico became a state in 1912.

What kinds of determiners are mutually exclusive and what are not mutually exclusive? Give one example for each.

Using extraposition in the following sentence:

She considers that I didn't consult her quite outrageous.

Using a cleft sentence:

President Kennedy’s 1961 White House Conference on Aging first focused the nation’s attention on the concerns of old people.

Using inversion in the following sentence:

I only realized what trouble he was in when I heard his voice trembling.

Using passive voice in the following sentence:

Didn’t they tell you to be here by eight o'clock?

Using an adjunct in the following sentence:

From an artistic point of view, the film was a great success.

Using a disjunct in the following sentence:

It is quite obvious that he does not want to go with us.

Using a non-finite verb form in the following sentence:

The chairman threatened that he would resign if his policies were not adopted.