An interrogative clause is a clause whose form is typically associated with question-like meanings.For instance, the English sentence "Is Hannah sick?" has interrogative syntax which distinguishes it from its declarative counterpart "Hannah is sick". Also, the additional question mark closing the statement assures that the reader is informed of the interrogative mood. The simple present tense is one of the most commonly used in English grammar tenses. It is used to express an action that is routine, repeated, or may state some facts. We have put down 50 simple present tense sentences (affirmative, negative, and interrogative sentences) for you. So, here is the formula of the past perfect tense. Subject + had + past participle + the rest of the sentence. The structure of the past perfect tense can be learnt by analyisng how it is used in a positive, negative, interrogative and negative interrogative sentence. Structure of the Past Perfect Tense. Present Perfect Tense. Positive Sentences - Subject + have/has + V3. I have already prepared breakfast. My sister has cleaned the room. It has rained a lot lately. Negative Sentences - Subject +have/has + not + V3. I have not (haven't) prepared breakfast yet. My sister has not (hasn't) cleaned the room. It has not (hasn't) rained a lot. Question Sentences - Have/Has + Subject + V3 Let's see the formulas of affirmative, negative, and interrogative sentences. Affirmative Sentences. Formula for affirmative sentences. Negative Sentences . Subject + will have + not + been + present participle + time reference. Examples. They will not have been living in this house for 15 years. The present perfect continuous tense expresses an action that has been started in the past and continues to the present. Examples: The boys have been living in this city for 10 years. It has been raining since Tuesday. The girls have been cooking the food since last three weeks. Those children have been running in the park since morning. The difference between Do and Does given below: ' Do ' is used with the plural nouns and pronouns. Example: (I) I/We/You + do not + work. (II) They boys do not work. ' Does ' is used with the singular nouns and pronouns. Examples: He/She/It/does not work. The boy does not work. In negative sentences, the auxiliary verb "did" is used in its past tense form, followed by "not" and the base form of the verb. In interrogative sentences, the subject and the auxiliary verb "did" are inverted, and the base form of the verb follows the auxiliary verb. Present Continuous Tense Formula. Subject + am/is/are + present participle (verb+ing) + the rest of the sentence. However, there are other things to be aware of. You should also learn how sentences are constructed using the present tense of verbs when the verbs are positive, negative, interrogative, and negative interrogative. NEGATIVE AND INTERROGATIVE SENTENCES Transform the following sentences into the negative and the interrogative. 1 Example: (See unit 22 .) I can dance. I can't dance/I cannot dance. Can I dance? a She can swim. b They can help you. c We can ride a horse. d He can drive a lorry. e It can fly. 1HV0k.