Put the verbs in brackets into the Past Simple or the Present Perfect Tense 1) It's very cold here you ... (to turn on) the heater? -Yes, 1I.. (to turn) it on ten minutes ago. 2) ls your boss in the office?-No, he ... (to go) to Berlin on business.-When... he He ... (to leawe) two days ago. 3). ...(to leave)? Frank (yet to book) the tour to Europe?-Yes, he (ro phone me from the travel agency half an hour ago. 4) How long.. you He .(to know) Emma?-We... (to be) friends since we... (to be) seven years old. 5) Who you.. (to get) a letter from?-It isn't a letter, it's an invitation to a wedding party. I... (to get) t from Molly and Den an hour ago.

1) It's very cold here, have you turned on the heater? -Yes, I turned it on ten minutes ago.
Explanation: In this sentence, we use the Present Perfect Tense "have you turned on" to ask about a past action that has a connection to the present moment. The answer is given in the Past Simple Tense "I turned it on" to indicate that the action happened in the past.

2) Is your boss in the office? -No, he has gone to Berlin on business. -When did he leave? He left two days ago.
Explanation: In this sentence, we use the Present Perfect Tense "has gone" to talk about the boss's current state (not being in the office) and to indicate that the action happened in the past but has an impact on the present. The question "When did he leave?" is in the Past Simple Tense, and the answer "He left two days ago" is also in the Past Simple Tense to indicate the specific time in the past when the boss left.

3) Has Frank left? Has he booked the tour to Europe yet? -Yes, he phoned me from the travel agency half an hour ago.
Explanation: In this sentence, we use the Present Perfect Tense "has Frank left" to ask about an action that started in the past (Frank leaving) with possible relevance to the present. The second question "Has he booked the tour to Europe yet?" is in the Present Perfect Tense to emphasize that it is an action that is still expected to happen in the future. The answer "Yes, he phoned me from the travel agency half an hour ago" is in the Past Simple Tense to indicate the specific time in the past when Frank phoned.

4) How long have you known Emma? -We have been friends since we were seven years old.
Explanation: In this sentence, we use the Present Perfect Tense "have you known" to ask about the duration of a past action that has a connection to the present. The answer is given in the Present Perfect Tense "we have been friends" to indicate the duration of the friendship starting from the past and continuing until now.

5) Who did you get a letter from? -It isn't a letter, it's an invitation to a wedding party. I got it from Molly and Den an hour ago.
Explanation: In this sentence, we use the Past Simple Tense "did you get" to ask about a specific past action (receiving a letter). The answer "I got it from Molly and Den an hour ago" is in the Past Simple Tense to indicate when and from whom the invitation was received.