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| | Sequence of Tenses |
 | | Problems in sequencing tenses usually occur with the perfect tenses, all of which are formed by adding an auxiliary or auxiliaries to the past participle, the third principal part. |
| | The present perfect consists of a past participle (the third principal part) with "has" or "have." It designates action which began in the past but which continues into the present or the effect of which still continues. |
| | Infinitives, too, have perfect tense forms when combined with "have," and sometimes problems arise when infinitives are used with verbs such as "hope," "plan," "expect," and "intend," all of which usually point to the future (I wanted to go to the movie. |
| owl.english.purdue.edu /handouts/grammar/g_seqtense.html (573 words) |
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