Consider

[Allifathima]

1. You should consider this information as top secret.
2. He consider everything I say as a joke.
3. My parents still consider me like/as a child.
4. Consider everyone as an equal to you.
5. All cases involving children are considered as urgent.
   6a. He’s considering buying a used car.
   6b. He’s considering to buy a used car.
   Please correct and comment.
   Thanks.

[Beeesneees]

1. You should consider this information as (or ‘to be’) top secret.
2. He considers everything I say as a joke.
3. My parents still consider me as a child.
4. Consider everyone as an equal to you.
5. All cases involving children are considered as urgent.
   6a. He’s considering buying a used car.
   6b. He’s considering to buy a used car.

[Allifathima]

Beeesneees,

1. My parents still treat me as/like a child.
2. I consider him as/like a close-friend.
3. I treat him as/like a close-friend.
   Please correct and comment.
   Thanks.

[Beeesneees]

1. There is a subtle difference between ‘as’ and ‘like’.
   Using ‘as’ indicates that this is how the parents see you and treat you.
   Using ‘like’ might carry the indication that they recognise you are no longer a child but still treat you as if you were, through habit, concern or some other reason.

2. I consider him to be a close friend.

• you cannot consider someone to be like a close friend - you either consider that they are close or that they are not. ‘close friend’ does not take an apostrophe ever.

3. is okay, apart from the apostrophe, because you can treat someone in the same way as you would treat a close friend, even if they are not actually one of your closest friends.