Question

What is the sentence structure of
1. Present perfect continuous tense
2. Past perfect tense
3. Past perfect continous tense
4. Future perfect continuous
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Answer 1

Answer:

1. -subject +has\have+been+v1-ing+object
2. sub.+had+v3+obj
3. sub.+had+been+v1-ing+obj
4. sub+will/shall+have+v1-ing+obj