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Structural patterns. 1. Happen, seem + infinitive
1. Happen, seem + Infinitive How did you happen to get your arm caught in the machine? Jackson seems to have been badly treated. The verbs to happen and to seem may be followed by any kind of infinitive. The indefinite infinitive expresses an action simultaneous with the moment described in the sentence.
The continuous infinitive emphasizes that the action expressed by the infinitive is in process.
The perfect infinitive expresses an action prior to the moment referred to in the sentence.
2. Might + Perfect Infinitive They might have given me a watchman's job. Might have done expresses disapproval or reproach. The perfect infinitive refers the action to the past.
Note: When might is followed by an indefinite infinitive, the combination might do smth expresses a request with a shade of reproach and refers the action to the present or future.
3. Should + Infinitive Не agreed with Peter Donnelly that Jackson should have won his case and got damages. The modal verb should expresses obligation, advisability, desirability. It may be followed by any kind of infinitive. Should + indefinite infinitive refers the action to the present or the future.
Should + continuous infinitive refers the action to the immediate present.
Should + perfect infinitive refers the action to the past.
Note: The modal verbs should and ought (to) are very much alike in meaning. In many cases they are used interchangeably. However, ought to emphasizes moral obligation, whereas should is commonly used when instructions are given in the form of advice.
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