Quá khứ, hiện tại và tương lai của xúc tác dị thể. Xúc tác dị thể là xúc tác trong đó chất xúc tác ở khác pha với chất phản ứng.Chất xúc tác dị thể thường là chất rắn và phản ứng xảy ra trên bề mặt chất xúc tác. Thường gặp nhất là những hệ xúc tác dị thể gồm pha rắn và pha khí (các chất tham gia phả[r]
Making questionsAffirmative sentences in the simple present and simple past tense do not have an auxiliary verb. We use do,does or did to change them into questions.Note that do and does are used in the present tense. Do is used with plural nou[r]
Period: 7Date of teaching: ……………..Week: 7PASSIVE VOICE (CONT)- PREPOSITIONS OF TIME1/ Objective: By the end of the lesson, Students will be able to change and use the passivevoice in the present simple, the past simple and the [r]
Tenses exercise1. Which one of the following sentences is correct?a) I saw John yesterday.b) I have seen John yesterday.c) I will see John yesterday.d) I see John yesterday.2. Which of the following tenses are used to talk about recent actions that have present results?
Tenses different forms?Now read the following sentences:* I write.* I am writing.* I have written.* I have been writing.The verbs in all of these sentences refer to the present time, and are, therefore, said to be in the present tense.In sentence 1, h[r]
Identify the verb and the tenseRead the following sentences and identity the verbs in them. Also, state their tense.1. The river flows under the bridge.2. I will answer his letter tonight.3. It has been raining all night.4. I had finished befor[r]
Học ngữ pháp tiếng Anh qua VOA Câu điều kiện là một bài học nhỏ danh sách học ngữ pháp cùng VOA, sẽ giúp các bạn hiểu hơn về câu điều kiện loại 0, 1 và 2, đồng thời được rèn luyện kĩ năng đọc và nghe tiếng Anh thành thục. Mời các bạn tham khảo.In this weeks episode of Everyday Grammar, we are going[r]
Identify the type of conditional clausesConditional clauses are very common in English. They are usually introduced by the subordinating conjunction if.Conditional clauses can refer to the present, past or the future. The zero conditional usual[r]
... examine the relative roles o f earnings and non -earnings information in valuing R&D intensive firms In this model, the trade off between book value and expected future abnormal earnings makes the. .. other than the past history of earnings into their forecasts of future earnings If there were a[r]
Few outside of the world of science and technology have much concept of what nanotechnology involves. It is defined in terms of products and processes involving nanometre (i.e. 109 or 0.000 000 001 m) dimensions but this gives no flavour for what is truly involved. What may be surprising to many is[r]
Time indicated by modal auxiliary verbsThe words will, would, shall, should, can, could, may, might, must and ought to are called modal auxiliaryverbs. Sometimes the verbs dare and need are also considered as modals. Unlike primary auxiliaries which havedistinct forms to refer t[r]
This bachelor thesis deals with the use of Present Perfect in British and American news. The aim of the investigations is to find out which type(s) of Present Perfect uses is/are the most preferable in English news reports and the possible differences in the use of Present perfect in relation to Pas[r]
Have and get something doneWe use to have something done for awork/service done by someone for us. Hereare the most frequently used tenses with thisexpression:have + object + past participle(V3)Present ContinuousThey are having theircake packed.Going toHe is going to have[r]
Verb Tense Chart based on Azarsimple presentI study every day.present continuousI am studying right now.present perfectI have studied Chapter 1.present perfect continuousI have been studying for two hours.(habitual action – past to present to future)(action[r]
Direct and indirect speech: an overview of the rulesWhen the reporting verb is in the past tense, all present tenses in the direct speech will change into thecorresponding past tenses.For example, the simple present will be[r]
INDIRECT SPEECH – PRACTICE TEST No. 1 A. INDIRECT SPEECH I. Statements in reported speech 1. Using reporting verbs “say” hoặc “tell”: say to sb (that), say (that), tell sb (that) 2. Pronoun and possessive adjectives changes Ex: Bill said, “I’m having a party at my flat.” Bill said (that) he was[r]
THE GLASS HOUSE The Eden Project endeavours to both recognise our countrys great past heritage of plant exploration and at the same time look to the future. Helping to define, through research, a world where mankind can live and develop within sustainable parameters. To design the built form of a gl[r]
Tense recognition exerciseDo you know all the different tenses in English? Can you recognize them by just looking at their form? Here is agrammar exercise to test your understanding of tenses. You just need to read the sentences given below. Theyare in different tenses. See if you can[r]
B - Make Passive forms from the given phrases. Mind the tenses in brackets.1) the car - to repair (Present Perfect) ______________________________________2) computers - to replace (Past Progressive) ______________________________________3) the road - to clos[r]