Question

Join the sentence without "and" , "so" "but" .. He read the letter. He put out the lamp.​

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Answer 1

‘When’ will come here dm

Answer 2

After he had read the letter, he put out the lamp.

Use of 'after' combines the given sentence. Since the work done in the second sentence depends on work done in first sentence on basis of passed time period, we use 'after' while referring to first work while joining both the sentences.