How to make a collision in construct2?

Could anyone please help me, how to make a collision with two objects by using another object at a time in construct2?

Your question is very unclear. You want two objects to collide, but there is a third object?

sai sronitha Before asking many basic questions you really need to read the manual and do some tutorials. All of this is covered in the basic tutorials and in the manual. You will get much better responses if you ask questions that are not thoroughly covered in the beginners documentation.