Indirect questions

Infographic illustrating the structure of direct and indirect questions in English grammar with examples, displayed on a bright, color-coded chart.

These are some other common expressions used before indirect questions:

I don’t know what he is doing here.
I wonder when he will find the truth.
I’m not sure when I can come.
I’d like to knowwhere you left the documents.

For yes-no questions (when there is NO question word), we can use both if or whether:

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