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To tear means to divide along a straight or irregular line, sometimes by accident. To tear up means to destroy by tearing to pieces.
The word up is often used with verbs to express the idea of greater completeness: burn up, drink up, dry up, cut up, eat up, shut up, use up.
It's better to use keep for a more or less permanent resting place, and put for a temporary one.
Use the comparative when two people or things are compared.
Place the preposition for before words or phrases denoting a period of time: for three days, for six weeks, for two years, for a few minutes, for a long time. Use it with any tense except the present.
For is often omitted. We can say: I've been here for two years or I've been here two years.