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Hi teachers,

Can I say like this ?
a/ I remember that at that time some of my friends found John and Alice going to the movies together, and since then they began/had begaun to pair John off with Alice . Everyone thought it was just a tease , but 3 years after that John and Alice really became a husband and a wife together.
b/One day she discovered that Tommy had been going out with another girl and since then/from then on she began /had begun bebhaving coldly to him.

Thank you in advance
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A few possibilities:

a1) ... and (after that / from then on) they began to pair John off with Alice. -- means they were pairing them off for some unspecified period of time after discovering them at the movies. "after that / from then on" is implied by the context, so can be omitted with no real change in meaning.

a2) ... and since then they have been pairing John off with Alice. -- unlikely in context, because "since" implies "up to now", and we know the two got married, so there would be no need for their friends to continue with the "pairing off" after that.

a3) ... and since then they have begun to pair John off with Alice. -- unlikely in context, for the same reasons. Similar in meaning to (a2), but implies that the process of pairing off is still at a tentative stage.

b1) ... and after that / from then on she began behaving coldly to him. -- means she behaved coldly for some unspecified period of time after her discovery.

b2) ... and since then she has been behaving coldly to him. -- means that the cold behaviour continued from the time of her discovery up to the present time.

b3) ... and since then she has begun behaving coldly to him. -- similar to (b2), but implies that her cold behaviour has started relatively recently.
Comments  
Thank you ever so much Mr Wordy . Your explanations are easy to understand .