A1 Grammar: verb "to be"

1) Tina sunbathed/was sunbathing while her children swam/were swimming in the sea.

2) Mr White phoned /had phoned us after the conference was beginning/had begun.

3) My brother bought/had bought this computer a year ago.

5) We had/were ha ving breakfast when our neighbour knocked/had knocked at the door.

am

is

are

on

was

is

are

in

were

are

is

am

is

am

are

were