This is book. it is my book. 2. is this your pencil? — no, it isn't my pencil, it is ray sister's pencil. 3. i have sister. my sister is engineer. my sister's husband is doctor. 4. i have no handbag. 5. is this watch? — no, it isn't watch, it's pen. 6. this pen is good, and that pen is bad. 7. i can see pencil on your table, but i can see no paper. 8. give me
chair, please. 9. they have dog and two cats. 10. i have spoon in my plate, but i have no soup in it. нужно вставить артикли и объяснить почему он там стоит

A student asking a question, a question asked by a student, asking a question, having asked a question. An engineer using new materials, used materials, using materials, having used new materials. A tool registering the depth, the depth registered by the tool, registering the depth, having registered the depth. A specialist analyzing oil properties, oil properties analyzed in laboratory, analyzing oil properties, having analyzed oil properties. Students passing exams, exam passed by students, passing the exam, having passed the exam. A scientist making a report, a report made by the scientist, making a report, having made a report. Engineering building roads, roads built by engineers in the region, in (зависит от контекста) building roads, having built the roads

1. John and Mary have just gone away
2. My friend has already answered the letter
3. I have read this book today
4. We hanen`t seen him for three years 
5. He he hasn`t eaten sweets for two weeks 
6. My elder brother has just cleaned his shoes
7. They have just had breakfast
8. I hane met him this morning
9. My father has missed the bus this afternoon
10. He has done it today 

1. Have they missed the last train lately ?
2. Hs Liz  made a speech this evening ?
3. Have the children decorated the room this morning ?
4. Has he just come home?
5.Has  the girl swept the floor in the flat today?
6. Have they  dsnced in the next room lately evening?