Make 5 questions (general, who-questions, 2 special, tag -question) 1.he was

Общий вопрос.

1. Was he going to catch the 6 oclock train?

2. Did he catch the 6 oclock train?

Who-question задают к подлежащему.

1. Who was going to catch the 6 oclock train?

2. Who caught the 6 oclock train?

Особые вопросы.

1. What was he going to catch at 6 oclock? What train was he going to catch? 

2. What did he catch at 6 oclock? What train did he catch? 

В tag-question идет обыденный порядок слов и "хвостик".

1. He was going to catch the 6 oclock train, wasnt he?

2. He caught the 6 oclock train, didnt he?