To turn I-adjectives into the negative form, you replace I with KUNAI. So, the negative form of ATARASHII (new) is ATARASHIKUNAI (not new). To make NA-adjectives into their negative form ...

In negative questions either add a question mark to a statement and change your voice to a questioning tone, or insert est-ce que into the question. The negative form or never, not, nothing ...

This in turn induces negative selection on the current form of the parasite while leading to positive selection of variants that cannot be recognized by the host. Furthermore, if such variant ...

To turn this into the negative, we change ARIMASU to ARIMASEN. So, the negative form of UTATTA KOTO GA ARIMASU (I have sung (it) before) becomes UTATTA KOTO GA ARIMASEN (I have never sung (it ...