问题: 这其中为什么要加一个“do“？
Can you let me know when you do expect to have some preliminary info back? 这句话是什么意思？这其中为什么要加一个“do“？
解答:
do是强调助词，这个用法并不少见。
意思就是：如果你确实期望……
（1）A: Do you love me?
B: I swear it. I do love you.
（2）You always say it doesn’t matter, but it does matter.
（3）He told me he saw a ghost, but I wonder whether he really did believe it himself.
（4）He claimed to be rich and did occasionally have a ten-pound note in his wallet.
在祈使句中，do表强意的请求，而不是命令，有时它可以使邀请对方的心意更加客气、热情、友好，而且亲切，此时的do可译为“务”、“务必”等。例如：
（6）Please do sit down.
（7）Do be careful!
（8）Do tell me all about it. I’ll keep it a dead secret.
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