1. define the part of speech of the underlined word: don't come tomorrow,i'll be out. 2. define the part of speech of the underlined word: still waters run deep. 3. define the part of speech of the underlined word: it was too late hour to come. 4. define the part of speech of the underlined word: it was still too hard to understand. 5. define the part of speech of the underlined word: he looked out of the window. 6. define the part of speech of the underlined word: he came back too late.