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explains; to has explained; for explained; with has explained; to
in; problem out; problem in; problems on; problems
had he begun he began did he begin began he
has been working will have worked will have been working had worked
Given To give To be given Giving
that he began did he begin then he began so that he began
has been working will have worked would have worked had worked
solve solves to solve solving
too difficult to so difficult that difficult enough for too difficult for
has been working will have worked will have been working had worked
hard; hardly hardly; hard hard; hard hardly; hardly
inspiration identification reaction comprehension
did he begin he began he did begin began he
went on put on gave up put up
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