<P> The present and past are distinguished by verb form, using either ablaut (sing (s) ~ sang) or suffix (walk (s) ~ walked). For details, see English verbs . </P> <P> English also has continuous (progressive) aspect and perfect aspect; these together produce four aspectual types: simple, continuous, perfect, and perfect continuous . Each of these can combine with the tenses to produce a large set of different constructions, mostly involving one or more auxiliary verbs together with a participle or infinitive: </P> <Table> <Tr> <Td_colspan="2"> </Td> <Td_colspan="4"> Tenses </Td> </Tr> <Tr> <Td_colspan="2"> Morphological </Td> <Td_colspan="2"> With auxiliaries </Td> </Tr> <Tr> <Td> Present </Td> <Td> Past </Td> <Td> Future </Td> <Td> Future - in - the - past </Td> </Tr> <Tr> <Td> Aspects </Td> <Td> Simple </Td> <Td> go (es) </Td> <Td> went </Td> <Td> will go </Td> <Td> would go </Td> </Tr> <Tr> <Td> Continuous </Td> <Td> am / is / are going </Td> <Td> was / were going </Td> <Td> will be going </Td> <Td> would be going </Td> </Tr> <Tr> <Td> Perfect </Td> <Td> have / has gone </Td> <Td> had gone </Td> <Td> will have gone </Td> <Td> would have gone </Td> </Tr> <Tr> <Td> Perfect continuous </Td> <Td> have / has been going </Td> <Td> had been going </Td> <Td> will have been going </Td> <Td> would have been going </Td> </Tr> </Table> <Tr> <Td_colspan="2"> </Td> <Td_colspan="4"> Tenses </Td> </Tr>

How many tense forms are there in english
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