Question

Since we came here , the teacher_____(begin) to teach the rules .​

Answer 1

Answer:

Since we came here , the teacher had begun to teach the rules .

Explanation:

This sentence is in past perfect tense.

The Past tense has four forms

• Simple Past Tense

• Past Continuous Tense

• Past Perfect Tense and

• Past Perfect Continuous Tense

The past perfect tense indicates

• An action completed in the past before a certain moment in the past.

• An action completed before another action that happened in the past in such sentences, the simple past tense is used in one clause and the past perfect tense in the other.

• The past perfect continuous tense indicates an action that began before a certain time in the past and continued up to the time or stopped just before it.

Answer 2

Answer:

Since we came here , the teacher has begin (begin) to teach the rules .