Before he ____(to sing) a song he____(to play ) the guitar.
2.She _____ (to watch ) a video after the children ____ (to go) to bed.
3.After John ___ (to make breakfast he ___ (to phone) his friend.
4.I ___ (to be ) very tired because I ___ (to study ) too much
5.They ___ ( to ride) their bikes before they __ (to meet) their friends.
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Before he sang a song he had played the guitar.

She watched video after the children had gone to bed.

After John had made breakfast he phoned his friend.

I was very tired because I had studied too much.

They had ridden their bikes before they met their friends.