Fill in the gaps to practise the use of the complex object (the verb is given in brackets at the end of each sentence): 1. they saw him the street (to cross).

They saw him crossing(cross)the street.

1. They saw him in the street crossing (to cross).

Explanation: In this sentence, we are using the complex object. The verb "saw" is followed by the pronoun "him" and the prepositional phrase "in the street crossing." The prepositional phrase provides additional information about the action of seeing him. The verb "to cross" in brackets indicates that it is the action being performed by him in the street.

Step-by-step solution:
- To start, we need to identify the main verb of the sentence, which is "saw."
- Next, we need to determine who or what the subject of the sentence is. It is not mentioned in the sentence, so let's assume it is "They."
- Now, we turn our attention to the object. The noun pronoun "him" serves as the direct object of the verb "saw." It answers the question "Who did they see?" and refers to the person being seen.
- Finally, we have the prepositional phrase "in the street crossing." The preposition "in" indicates location, and "the street" specifies where the action takes place. The gerund "crossing" serves as the object of the preposition and describes the action being performed by him.

By filling in the gaps and including the verb "to cross" in brackets, we have completed the sentence and provided practice for using the complex object.