Question

Помогите пожалуйста .Раскройте скобки , употребляя глаголы в Present Simple или Past Simple:the lesson already (to start) when (to arrive).When Christina(to arrive ,the film ... already.(to begin).He ..(to play )guitar before he..(to sing)a song.children ..(to ride) their bicycles before they ...(to meet)friends

Answer 1

The lesson had already started when we arrived.
When Christina arrived, the film had already begun.
He had been playing  the guitar before he sang a song.
The children had been riding their bicycles before they met friends.

Answer 2

The lesson already started when I arrived. When Christina arrived, the film had already begun. He played guitar before he sang a song. The children rode their bicycles before they met their friends.

In the first sentence, "the lesson already (to start) when (to arrive)", we need to use the Past Simple tense for both verbs. So, the correct form is "the lesson already started when I arrived".

In the second sentence, "When Christina (to arrive, the film ... already (to begin)", we need to use the Past Simple tense for "to arrive" and the Present Perfect tense for "to begin". So, the correct form is "When Christina arrived, the film had already begun".

In the third sentence, "He (to play) guitar before he (to sing) a song", we need to use the Past Simple tense for both verbs. So, the correct form is "He played guitar before he sang a song".