When do we use which tense

When do we use which tense?

1. 'Already' is a signal word for __________(Simple Past/ Past Perfect)

2. 'before that day' is a signal word for  __________(Simple Past/ Past Perfect)

3. 'first' is a signal word for __________(Simple Past/ Past Perfect)

4. 'up to then' is a signal word for __________(Simple Past/ Past Perfect)

5. 'then' is a signal word for __________(Simple Past/ Past Perfect)