Genki 20-4 Questions within Larger Sentences

You can include a question as part of a longer sentence and express ideas such as "I don't know when the test is" and "I don't remember whether Mary came to the party."

Quoted question clauses are in short forms. Note that the clause ends with the question particle か when it contains a question word like だれ and なに, as in the first two examples, and that it ends with　かどうか when it does not contain such a question word, as in the third example.

山下先生は昨日なにを食べたか覚えていません

メアリーさんがどこに住んでいるか知っていますか。

週末、りょうこうに行くかどうかきめしましょう

Question-word question か

Yes/no question かどう

わかりません - don't know

しっています - do know

The present tense short form だ which is used with a な adjective or a noun at the end of a clause is usually dropped.

だれがいちばんじょうずか　わかりません

instead of

だれがいちばんじょうずだか わかりません

おわり