Вот правильные формы глаголов в Present Continuous для вашего текста:
- am writing (I + am + verb-ing)
- am studying (I + am + verb-ing)
- is helping (Sister — она, поэтому is + verb-ing)
- am not playing (Отрицание: am + not + verb-ing)
- am not watching (Отрицание: am + not + verb-ing)
- Are you doing (Вопрос: Are + подлежащее + verb-ing)
- are planning (Parents — они, поэтому are + verb-ing. При добавлении окончания буква n удваивается)
- are thinking (Parents — они, поэтому are + verb-ing)
- am looking (I + am + verb-ing)
Полный текст письма: Hi Albert, how are you? I hope you are well. I (1) am writing to you to tell you my news. Right now, I (2) am studying hard and my big sister (3) is helping me with my homework. We have important exams at school and I hope to get really good marks. So I (4) am not playing any games on the computer, and I (5) am not watching TV until after the exams. What about you? (6) Are you doing anything special these days? Maybe we can meet in the summer? My parents (7) are planning our holidays and they (8) are thinking about taking us to your country. That will be great! I (9) am looking forward to seeing you! Brian Хотите, чтобы я объяснил правила правописания при добавлении окончания -ing (например, почему в слове planning пишется две n)?