Present perfect simple or simple past?

• When we use the past simple, a specific time in the past is mentioned: 'Did you see the match last night?' or understood between the speakers: 'Did you see the match?' (We both know it was last night...). So, a question beginning with 'When...?' will normally be in the past simple.   
• We use present perfect for a past action where no specific time is mentioned or understood: 'I've been to Paris twice', or when there is a connection with the present: 'I've worked here for two years' (I'm still working here). 

Activity 1: Choose the correct answer.
Activity 2: Click on the words in the correct order.                
Activity 3: Complete the sentences with the correct tense.
Activity 4: For and since.
Activity 5: For and since.
Activity 6: Listen and write the verbs in the correct tense.
Activity 7: Yet, just, already.
Activity 8: Yet, just, already.