In for a penny and in for a pound: When someone is intrestingly invested his or her time for some project or important prospectus that may provide him or her with handsome return then you give your best so as to get the best of yourself. 

sentence - When the employees got to know that increment is going to happen then they put all in for a penny and in for a pound. 

A bird in the hand is better than two in the bush. 

Meaning - You must get the best out of something you have in your hand or you must grab am opportunity in hand before thinking of future prospects because who knows what will happen in future. The best part of life is that Time wait for no one and you must otherwise cry over the spilt milk. So you must learn from your mistake and improve it before it too late. 

Sentence- A police caught or apprehended 3 criminals but the police man saw that one of the suspect was running away so he didn't gave a second thought of running behind that criminal because the police man knows that a bird in hand is better than two in bush. 

Chip off the old block-If one person is exactly like his or her parents in the way they deal with problems and how they react to some situations and their actions similar to their parents made other think that they have been watching to their parents or some things that they have seen in past . 

Sentence : When my grandmother saw me collecting coins of different country similar to his own son who have been doing the same thing when he was kid then she mesmerized at that time and she knew that its a chip off the old block. 

Do unto others as you would have them do unto you:You must treat other people in the same manner you yourself want to be treated otherwise you must not regret latter that why everyone hates you. so it is similar to what you sow shall you reap. So if you are going to plant a seed then that seed will grow into a tree and later give you shadow and fruits.newton law states tat everything has an equal and opposite effect. 

sentence - Ram was pretty cold toward the beggar because and i felt sorry for the beggar. who know what will happen in future with you.