Active Voice : - In the active voice, the sentence's subject performs the action on the action's target.

Passive Voice : - In the passive voice, the target of the action is the main focus, and the verb acts upon the subject.

Conversion  of Passive Voice Sentence into Active Voice For Simple Future Tense:

Rule used to identify that the sentence is in Passive Form with simple future tense is:

subject + will/shall + be + third form of verb + by + object.

For Example:

• Students will be taught by teachers. ( passive )

The subject is 'students', object is teachers and 'taught'  is the third form of the verb teach.'by' is used here according to the format.

While converting into Active Voice the rule will be :

subject + will/shall + first form of verb + object

In the question : -

1. Our country shall not be betrayed by us.

The active form of above sentence in simple future tense is : -

We shall not betray our country . In this sentence , object ( our country) is converted into subject (we) and then ,  we use first form of verb (will / shall ) here , the subject is we , so we use shall with it ,  and then the remaining part is the object (we) .

2. The hill station will not be visited by us this year.

The active form of above sentence in simple future tense is : -

We will not visit the hill station this year . In this sentence , object (us) is converted into subject (we) and then ,  we use first form of verb (will) , and then the remaining part is the object (we) . It is the negative sentence and in negative sentence , we use not after first form of verb .

Thus , the Correct Option is A , 1. We shall not betray our country . 2. We will not visit the hill station this year.

The house will be built by the mason in three months.

Sure, let's break down each option:

1. "The house will be built by the mason in three months" - This option is in the passive voice. The subject of the sentence ("the house") is being acted upon by the verb ("will be built"), and the doer of the action (the mason) is mentioned using the preposition "by."

2. "The house is built by the mason in three months" - This option is also in the passive voice. However, it's in the present tense rather than future tense. It conveys a general truth or ongoing situation.

3. "The house was building by the mason" - This option is not grammatically correct. "Was building" is in the active voice, but it lacks proper syntax. It should be "The house was being built by the mason."

4. "The house is build by the mason" - This option is not grammatically correct. "Is build" is incorrect verb tense. It should be "is built" to maintain proper tense agreement in the passive voice.

So, the correct passive voice construction for the given sentence is: "The house will be built by the mason in three months."

Hence Option A is Correct. 

Active Voice : - In the active voice, the sentence's subject performs the action on the action's target.

Passive Voice : - In the passive voice, the target of the action is the main focus, and the verb acts upon the subject.

Conversion  of Passive Voice Sentence into Active Voice For Simple Future Tense:

Rule used to identify that the sentence is in Passive Form with simple future tense is:

subject + will/shall + be + third form of verb + by + object.

For Example:

• Students will be taught by teachers. ( passive )

The subject is 'students', object is teachers and 'taught'  is the third form of the verb teach.'by' is used here according to the format.

While converting into Active Voice the rule will be :

subject + will/shall + first form of verb + object

In the question : -

1. Bad times will be overcome by us.

The active form of above sentence in simple future tense is : -

We shall overcome the bad times. In this sentence , object ( bad times). is converted into subject (we) and then ,  we use first form of verb (will / shall ) here , the subject is we , so we use shall with it and then the remaining part is the object (bad times) .

2. The car will be cleaned by Ram and Sam . 

The active form of above sentence in simple future tense is : -

Ram and Sam will clean the car. In this sentence , object( the car ) is converted into subject ( ram and sam) and then ,  we use first form of verb (will / shall )  and then the remaining part is the object (the car ) .

Thus , the Correct Option is D , 1. We shall overcome the bad times. 2. Ram and Sam will clean the car .