Positive tags of the following:

(1)It isn't raining.
(2)You don't like coffee.
(3)We mustn't tell her.
(4)They will not help.
(5)The file isn't ready yet

In order to determine the positive tags of the given statements, we need to add a positive tag to the end of each sentence. Positive tags are short phrases that confirm or seek agreement with the statement made in the sentence. They are added to confirm the speaker's belief or seek confirmation from the listener. To construct positive tags, we typically use auxiliary verbs that match the tense and formality of the original sentence.

Let's analyze each statement and add the positive tags accordingly:

(1) It isn't raining, is it?
In this case, the original sentence is in the negative form, so the positive tag is "isn't it?" The tag seeks agreement with the speaker's belief that it isn't raining.

(2) You don't like coffee, do you?
Since the original sentence is negative, the appropriate positive tag in this case is "do you?" The tag is used to confirm the speaker's belief that the person doesn't like coffee or to seek confirmation from the listener.

(3) We mustn't tell her, must we?
Here, the original sentence is also negative, so the positive tag "must we?" is added. This tag seeks agreement with the speaker's belief that they shouldn't tell her or asks for confirmation from the listener.

(4) They will not help, will they?
Because the original sentence is negative, the suitable positive tag in this situation is "will they?" The tag confirms or seeks agreement with the belief that they won't help.

(5) The file isn't ready yet, is it?
Once again, the original sentence is negative, so the positive tag "is it?" is added to seek agreement with the belief that the file isn't ready yet or to ask for confirmation from the listener.

In summary, the positive tags for the given statements are:
(1) It isn't raining, is it?
(2) You don't like coffee, do you?
(3) We mustn't tell her, must we?
(4) They will not help, will they?
(5) The file isn't ready yet, is it?