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The present perfect tense of "they have" is "they have had."
"Is" is present tense, while "was" is past tense.
The present tense is "see" except for the third person singular, which is "sees."
It shouldn't have an 's'
The tense for the sentence "I am speaking English" is present continuous tense.
The present tense of follow is:I/You/We/They follow.He/She/It follows.The present participle is following.
"Sing" itself, except with a third person singular subject, for which the present tense is "sings".
The present participle is "costing", and the present indicative tense is "cost" except for the third person singular, which is "costs".
In present tense, "should" is used to indicate a suggestion, recommendation, obligation, or expectation. It is often used to give advice or express what is the right thing to do in a particular situation.
Decides (present tense) should be decided (past tense).
Yes, the question should be answerable in the same tense. If the question is asked in present tense, the answer should also be given in present tense.
No, should is actually future tense