_____ more time, he could have done the work much better. 　　

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shouldn’t have done could have done might not do could do

have had had had had will have had

could was able to could have done would have been able to

more efficiently a worker a more efficient worker more an efficient worker a worker more efficiently

Now and then More or less From time to time Here and there

could have won; had practised could win; practised should have won; could have won would win; had practised

could get got had got would have got

can he was he hasn’t he could he

To be given　 To give Given　　 Giving

had done would to could have clone have done

can write could have written could write have written

shouldn't have done could have done might not do could do

must have got through ought to have got through would get through could get through

more efficiently a worker a more efficient worker more an efficient work a worker more efficiently

To be given　 To give Given　　　 Giving

could have won; had practised could win; practised should have won; could have practised would win; had practised

mustn't have hurried needn't have hurried could have hurried ought to have hurried

can write could have written could write have written