Помогите пожалуйста, здесь нужно поставить глагол в правильную форму a) Usually we _______________ (to...

Давайте разберем каждое предложение и поставим глаголы в правильную форму.

a) Usually we have classes on the campus, but today we are going to the training airfield.

• Первая часть предложения говорит о регулярном действии, поэтому используем Present Simple: "have".
• Вторая часть - о действии, происходящем сейчас, поэтому используем Present Continuous: "are going".

b) I did not come to the lecture yesterday. I was not feeling very well. I hope my friends will give me the notes later.

• Для действия, которое не произошло в прошлом, используем Past Simple в отрицательной форме: "did not come".
• Для выражения состояния в прошлом используем Past Continuous: "was not feeling".
• Для будущего действия используем Future Simple: "will give".

c) Specialists from our Research Institute have just finished the experiment. They have been working on it for a month.

• "Just" указывает на действие, только что завершившееся, используем Present Perfect: "have just finished".
• Для продолжительного действия в прошлом, которое завершилось к настоящему моменту, используем Present Perfect Continuous: "have been working".

d) My telephone rang while I was playing basketball in the sports center. It was my friend Julie who told me I had got an excellent mark for my presentation.

• Для завершенного действия в прошлом используем Past Simple: "rang".
• Одновременное продолжительное действие в прошлом - Past Continuous: "was playing".
• Завершенное действие в прошлом - Past Simple: "was".
• Для действия, которое произошло до другого действия в прошлом, используем Past Perfect: "had got".

e) I want to go to this concert tomorrow. I think that I will have finished writing my course paper.

• Для будущего завершенного действия используем Future Perfect: "will have finished".

f) Samara University will have been cooperating with Oxford Polytechnic for 10 years by the end of this semester.

• Для действия, которое будет продолжаться до определенного момента в будущем, используем Future Perfect Continuous: "will have been cooperating".

g) I have not read the book on history of aviation yet, so I will be doing it all day tomorrow.

• Для незавершенного действия к настоящему моменту используем Present Perfect в отрицательной форме: "have not read".
• Для действия, которое будет происходить в конкретный период в будущем, используем Future Continuous: "will be doing".

h) – What is that noise? What is happening?

• I do not know. Maybe the machine has broken down.

• Для действия, происходящего в данный момент, используем Present Continuous: "is happening".

• Для выражения незнания в настоящем времени используем Present Simple в отрицательной форме: "do not know".
• Для действия, завершившегося к настоящему моменту, используем Present Perfect: "has broken down".

j) Do you know who invented this kind of engine?

• Для выражения завершенного действия в прошлом используем Past Simple: "invented".

k) I bought this book last week, but I have not read it yet.

• Завершенное действие в прошлом - Past Simple: "bought".
• Незавершенное действие к настоящему моменту - Present Perfect в отрицательной форме: "have not read".

l) Annie asked me how to use this machine. She had never used it before, so she did not know what to do.

• Для выражения действия, которое не происходило до определенного момента в прошлом, используем Past Perfect: "had never used".
• Для выражения незнания в прошлом используем Past Simple в отрицательной форме: "did not know".

a) Usually we have classes on the campus, but today we are going to the training airfield. b) I did not come to the lecture yesterday. I did not feel very well. I hope my friends will give me the notes later. c) Specialists from our Research Institute have just finished the experiment. They have been working on it for a month. d) My telephone rang while I was playing basketball in the sports center. It was my friend Julie who told me I had got an excellent mark for my presentation. e) I want to go to this concert tomorrow. I think that I will finish writing my course paper. f) Samara University has been cooperating with Oxford Polytechnic for 10 years by the end of this semester. g) I have not read the book on the history of aviation yet, so I will do it all day tomorrow. h) - What is that noise? What is happening?

• I do not know. Maybe the machine has broken down. j) Do you know who invented this kind of engine? k) I bought this book last week, but I have not read it yet. l) Annie asked me how to use this machine. She has never used it before, so she does not know what to do.

a) usually have, are going b) did not come, did not feel, will give c) have just finished, have been working d) rang, was playing, was, had got e) will finish f) has been cooperating g) have not read, will do h) is happening, do not know, has broken down j) invented k) bought, have not read l) has never used, did not know