5.Make the sentences using Present Perfect 1. We/to return/from the journey/just.
2. I/ not to see/my boss/today.

3. Helen/to decorate/her room/already.?

4.My cousins/to be/to this cinema/never.

5. Max/to buy/а magazine/today.

1. We have just returned from the journey.
To make this sentence in Present Perfect, we use the auxiliary verb "have" followed by the past participle form of the main verb "return." The word "just" indicates that the action of returning from the journey happened very recently.

2. I have not seen my boss today.
To make this sentence in Present Perfect, we use the auxiliary verb "have" followed by the past participle form of the main verb "see." The word "not" is used to indicate the negative form of the sentence.

3. Has Helen already decorated her room?
To make this sentence in Present Perfect, we use the auxiliary verb "has" (since the subject is "Helen") followed by the past participle form of the main verb "decorate." The word "already" indicates that the action of decorating the room has been completed before now. The question mark at the end of the sentence shows that it is an interrogative sentence.

4. My cousins have never been to this cinema.
To make this sentence in Present Perfect, we use the auxiliary verb "have" followed by the past participle form of the main verb "be." The word "never" indicates that the action of going to this cinema has not happened at any time before now.

5. Max has bought a magazine today.
To make this sentence in Present Perfect, we use the auxiliary verb "has" (since the subject is "Max") followed by the past participle form of the main verb "buy." The word "today" indicates that the action of buying the magazine has happened on the same day as the present moment.