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We replace one thing with another, but we substitute one thing for another. The two phrases mean the reverse of each other: You replace gold with paper money. You substitute paper money for gold.
Let means to allow. Leave means to abandon or to go away from: Do you leave your books at school?
To form the simple future, use shall with the first person and will with the second and third persons. Will in the first person denotes resolution or personal determination, and shall in the second and third persons denotes either a command or a promise.
Should, the past tense of shall, and would, the past tense of will, have the same differences of meaning and use as the present forms shall and will. I was afraid that I should fail, I promised that I would help him.
To hire something is to pay to use it, usually for a short time, with one single payment: a suit, a bicycle, a rowing boat etc. To hire out is to offer something for someone else to hire.