Subject+had+Verb 3rd form+Rest of the sentence
Subject + Past Tense VerbFor example:I worked.
Yes. You can calculate the two roots of a quadratic equation by using the quadratic formula, and because there are square roots on the quadratic formula, and if the radicand is not a perfect square, so the answer to that equation has decimal.
"did" is the simple past, used for a completed action that does not continue into the present; it's all over. -I did my homework last night. "done" is the present perfect (past perfect would be "I had done"), used for an action performed at some time prior to the present but that may or may not extend into the present. It's also used for habitual action. I have done all my homework for today.
The simple future tense simply refers to actions that will happen in the future.(e.g. I will sing on your birthday)It follows this structure:Subject + Will + VerbThe future perfect tense is used to talk about the past in the future. It expresses an action in the future before another action in the future.(e.g. You will have finished college by then)It follows this structure:Subject + Will + Have + Past Participle of Verb
Major is usually an adjective it can mean big, significant eg The use of drugs is a major problem. Or it can mean greatest, best, most important eg The major composers are........ Major can also be a verb it means to take or qualify in a subject eg I majored in ecology. How many verb forms for major? present major/majors past majored past continuous was majoring present continuous is majoring present perfect have/has majored past perfect had majored future will major There are others but these are the main ones
The past perfect tense follows this structure:Subject + Auxiliary Verb "have" (had) + Past Participlee.g. I had finished my homework.
Past perfect is formed with: had + past participle had eaten had watched had seen had known had liked etc
The future perfect tense follows this formula: Subject + Will + Have + Past Participle For example: I + Will + Have + Done my homework by then.
Present PerfectSubject + Have/Has + Past ParticiplePast PerfectSubject + Had + Past ParticipleFuture PerfectSubject + Will + Have + Past Participle
The present perfect tense follows this structure: Subject + have/has + past participle. For example: I have watched. She has watched.
Subject + had + been + present participle For example, I had been singing.
Past perfect, present perfect and future perfect.
Past perfect is formed with - had + past participle.The past participle of shout is shoutedTherefore the past perfect verb is -- had shouted
use have and has subject + have/has + past participle + object. I have eaten the cake.
Subject + had + been + present participle For example, I had been singing.
Simple past perfect is 'I have tried'. Past perfect continuous is 'I have been trying'. Past perfect subjunctive is 'I had tried'
The past perfect tense is "had thought"