The present perfect tense is:
Have you ever seen the Taj before?
The present perfect tense of want is have/has wanted. Always is an adverb and does not change from one tense to another.
The present perfect tense is used to express experience, change or a continuing situation.
The present perfect tense is used when there is a connection with the past and the present. It is used to depict change, experience and a continuing situation. The future perfect tense, however, is used to talk about the past in the future.
It is the present perfect tense.
The present perfect tense of "I ate food with dahi" is: I have eaten food with dahi.
Present tense
The present perfect tense of "see" is "have seen." It is formed by using the present tense of "have" or "has" with the past participle of "see." For example, "I have seen that movie before."
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.
The present perfect tense of "watch" is "have watched" or "has watched." For example, "I have watched that movie before."
Did is the past tense of do. Have done is present perfect.
The present perfect tense can be used to express experience, a change or a continuing situation.