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Вообще an elephant. Но если предложении на подобие there some elephants over there (там несколько слонов), то some. Зависит от ситуации
2)Kate studied English at school.
-Did she studied English at school?
-Who studied English at school?
-Kate studied English at school,didn’t she?
-Did she studied English or French at school?
-Where did she studied English?
1. Robert's Computer
2. Mr. and Mrs. Ford's house
3. Boys' skates
4. Classroom's chairs
5. Musician's guitars
6. Kate and Sally's photoes
7. Women's hangbags
8. Yesterday's weather forecast
1) I studied for six hours yesterday afternoon, so i think i (will pass) the exam.