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might,could,can,have to ,can't,may ,must not ,were to ,could not,had to ,ought,was able to ,are to
1)i have a thorn in my finger. remove it.
stay here till you return?
3) remain friends after what has happened?
4)they were so tired that on their feet.
5)but that was not a method .it was a general idea to a method.
6)i have not finished writing my paper ,so i' it next term.
7) it because it is poisonous.
8) exchange views and information .conferences help in this .
9)they were told that the research work.
10)on his way he a narrow wooden bridge over a stream.
11)the departament of insurance has done its best it your case.
12)he wasn't at home but i him at his office.
13)"well, this exercise at home",said the teacher.

1) could
In this sentence, "could" is used to express the ability to remove the thorn from the finger. It implies that the person has the skill or capability to do it.

2) can we
In this sentence, "can" is used to ask for permission to stay until the person returns. It is used to inquire if it is possible or allowed for the person to stay.

3) can we
In this sentence, "can" is used to ask if it is possible to remain friends after what has happened. It implies the ability or feasibility of maintaining the friendship.

4) could not stand
In this sentence, "could not" is used to indicate that they were unable to stand because they were extremely tired. It implies the inability or lack of capacity to stand.

5) was not able to suggest
In this sentence, "was able to" is used to express the ability to suggest a method. It means that the person had the capability or capacity to come up with a method.

6) have to do
In this sentence, "have to" is used to express the necessity or obligation of writing the paper next term. It implies that it is required or mandatory to do it.

7) must not touch
In this sentence, "must not" is used to indicate the prohibition or the action that should not be taken. It means that it is necessary to avoid touching it because it is poisonous.

8) can help
In this sentence, "can" is used to express the ability or capability of conferences to help in exchanging views and information. It implies that conferences have the capacity or potential to assist in this.

9) were told to do
In this sentence, "were told" is used to indicate that they received instructions or directions to do the research work. It implies that they were given the command or guidance to carry out the task.

10) could see
In this sentence, "could" is used to express the ability or possibility of seeing the narrow wooden bridge over the stream. It means that there was an opportunity or chance to see it.

11) have done what
In this sentence, "have done" is used to express the completion or accomplishment of the best possible actions by the Department of Insurance in the person's case. It implies that they have taken all the necessary steps or measures.

12) found him
In this sentence, "found" is used to indicate the action of locating or discovering the person at his office. It means that the speaker succeeded in the search or investigation.

13) could do
In this sentence, "could" is used to express the ability to do the exercise at home. It implies that the person has the capability, opportunity, or possibility to perform the exercise in that location.