Verb Tense Sequence :
The relationship between verbs in a main clause and verbs in dependent clauses is important. These verb tenses don't have to be identical as long as they reflect, logically, shifts in time and meaning:
Although the various shades of time and sequence are usually conveyed adequately in informal speech and writing, especially by native speakers and writers, they can create havoc in academic writing and they sometimes are troublesome among students for whom English is a second language. This difficulty is especially evident in complex sentences when there is a difference between the time expressed in an independent clause and the time expressed in a dependent clause. Another difficulty arises with the use of infinitives and participles, modals which also convey a sense of time. We hope the tables below will provide the order necessary to help writers sort out tense sequences.
As long as the main clause's verb is in neither the past nor the past perfect tense, the verb of the subordinate clause can be in any tense that conveys meaning accurately. When the main clause verb is in the past or past perfect, however, the verb in the subordinate clause must be in the past or past perfect. The exception to this rule is when the subordinate clause expresses what is commonly known as a general truth:
The tables below demonstrate the correct relationship of tenses between clauses where time is of the essence (i.e., within sentences used to convey ideas about actions or conditions that take place over time).
Sequence of Tenses
|Role of Infinitive||Example(s)|
|To show same-time action or action later than the verb||Coach Espinoza is eager to try out her new drills. [The eagerness is now; the trying out will happen later.]|
|She would have liked to see more veterans returning. [The present infinitive to see is in the same time as the past would have liked.]|
(to have seen)
|To show action earlier than the verb||The fans would like to have seen some improvement this year. ["Would like" describes a present condition; "to have seen" describes something prior to that time.]|
|They consider the team to have been coached very well. [The perfect infinitive to have been coached indicates a time prior to the verb consider.]|
|Role of Participle||Example(s)|
|To show action occurring at the same time as that of the verb||Working on the fundamentals, the team slowly began to improve. [The action expressed by began happened in the past, at the same time the working happened.]|
|To show action occurring earlier than that of the verb||Prepared by last year's experience, the coach knows not to expect too much. [The action expressed by knows is in the present; prepared expresses a time prior to that time.]|
|Having experimented with several game plans, the coaching staff devised a master strategy. [The present perfect participle having experimented indicates a time prior to the past tense verb, devised.]|