<Dd> <Table> <Tr> <Th> Infinitive </Th> <Th> Introduced by a (modal) auxiliary verb </Th> <Th> Introduced by a main verb </Th> <Th> Introduced by a main verb plus to </Th> <Th> Functioning as noun phrase </Th> <Th> Functioning as the modifier of a noun </Th> </Tr> <Tr> <Td> laugh </Td> <Td> Do not laugh! </Td> <Td> That made me laugh . </Td> <Td> I tried not to laugh . </Td> <Td> To laugh would have been unwise . </Td> <Td> the reason to laugh </Td> </Tr> <Tr> <Td> leave </Td> <Td> They may leave . </Td> <Td> We let them leave . </Td> <Td> They refused to leave . </Td> <Td> To leave was not an option . </Td> <Td> the thing to leave behind </Td> </Tr> <Tr> <Td> expand </Td> <Td> You should expand the explanation . </Td> <Td> We had them expand the explanation . </Td> <Td> We hope to expand the explanation . </Td> <Td> To expand the explanation would have been folly . </Td> <Td> the effort to expand </Td> </Tr> </Table> </Dd> <Table> <Tr> <Th> Infinitive </Th> <Th> Introduced by a (modal) auxiliary verb </Th> <Th> Introduced by a main verb </Th> <Th> Introduced by a main verb plus to </Th> <Th> Functioning as noun phrase </Th> <Th> Functioning as the modifier of a noun </Th> </Tr> <Tr> <Td> laugh </Td> <Td> Do not laugh! </Td> <Td> That made me laugh . </Td> <Td> I tried not to laugh . </Td> <Td> To laugh would have been unwise . </Td> <Td> the reason to laugh </Td> </Tr> <Tr> <Td> leave </Td> <Td> They may leave . </Td> <Td> We let them leave . </Td> <Td> They refused to leave . </Td> <Td> To leave was not an option . </Td> <Td> the thing to leave behind </Td> </Tr> <Tr> <Td> expand </Td> <Td> You should expand the explanation . </Td> <Td> We had them expand the explanation . </Td> <Td> We hope to expand the explanation . </Td> <Td> To expand the explanation would have been folly . </Td> <Td> the effort to expand </Td> </Tr> </Table> <Tr> <Th> Infinitive </Th> <Th> Introduced by a (modal) auxiliary verb </Th> <Th> Introduced by a main verb </Th> <Th> Introduced by a main verb plus to </Th> <Th> Functioning as noun phrase </Th> <Th> Functioning as the modifier of a noun </Th> </Tr> <Tr> <Td> laugh </Td> <Td> Do not laugh! </Td> <Td> That made me laugh . </Td> <Td> I tried not to laugh . </Td> <Td> To laugh would have been unwise . </Td> <Td> the reason to laugh </Td> </Tr>

What is meant by finite and nonfinite verb