`text{I.}`
`4.` By the time we started our work, she had explain everything clearly.
`5.` Before my mother came home, my father had watered all the plants in the garden.
`text{II.}`
`1.` came - had left
`2.` got up - had left
`3.` had finished - went
`4.` da done - came
`5.` met - had divorced
`6.` hadn't bought - would have had.
`text{Good luck !}`
