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Scarcely isn't synonymous with rarely. Rarely means not often, scarcely means not quite: I had scarcely finished when he came.
We use ago in counting from the time of speaking to a point in the past; half an hour ago, three days ago, four months ago, five years ago, a long time ago. We use before in counting from a distant to a nearer point in the past. Napoleon died in 1821, he had lost the battle of Waterloo six years before.
When we use ago, the verb is always in the simple past tense: He came five minutes ago.
We can't use not so in the sense of not very. The expression He's not so rich implies a comparison: He's not so rich as you are.
Use very with adjectives and adverbs in the positive, and with present participles used as adjectives like interesting. Use much with comparatives.