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Take a look at the sentences in the examples, that use the form “Have Done”: I have done all my homework. John has done all his work for the week. Luana has done the dishes, so I didn’t have to. The janitors have done all the cleaning this morning, in case you haven’t no...
Learn the correct usage of "had to" and "has to" in English. Discover differences, examples, alternatives and tips for choosing the right phrase.
Examples I have been to that city. (present perfect) Shane has not been working on the tractor of late. (present perfect progressive)We would use have been when the sentence subject is I, you, we, or the third-person plural (the children have been studying grammar all morning; they ...
Learn the correct usage of "hasn't had" and "hadn't had" in English. Discover differences, examples, alternatives and tips for choosing the right phrase.
In the first sentence, you can see that a person has completed the work assigned to him recently. In the second sentence, you can find that a boss is applauding his employee that he has completed the work with perfection. ‘You have done it with perfection.’ ...
Caused- This happened in the past and is not happening now. "The fire was caused by the stove." Has caused- The action happened in the past, but the consequenses
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It would be interesting to determine what impact the 12 bp deletion in VA RNA II gene has on viral pathogenicity. Continuous surveillance is urgently required to explore the spatiotemporal variation and evolution of HAdVs. In conclusion, WGS has potential for use in aiding outbreak ...
Secondly, 'ought to' has a slightly different form.其次，“ought to”形式略有不同。Obviously, you need to add 'to'.很显然，需要加上“to”。Also, the negative form is not generally contracted.同样，否定形式通常不会简写。So, you can say: "You shouldn't have said that." With 'should ...