#3 is impossible. You should rewrite it as The key, he added, is to wake up early. 1) The suspect, I think, is Tom.
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Hans511) The suspect that I think of is Tom.2) I think that the suspect is Tom.I feel like there is no meaning difference between the #1 and the #2.No. That's not right. There is a difference in meaning between think of and think that.
Yes, you c
1. To combine (a column of figures, for example) to form a sum.
2. To join or unite so as to increase in size, quantity, quality, or scope: added 12 inches to the deck; flowers that added beauty to the dinner table.
3. To say or write further.
Hans51Thank you so much and now I understand it and so in some context, "the key he added is / was..." also can be used, right?No, I can't think of a context in which it would make sense. To me, 'he added' seems to be a relative clause defining the 'key'. You need to set it off with commas in order to preserve the intended meaning.