The suffix “na” is used in a similar way to “ne.” That is, it’s used to elicit a response from the listener to feelings expressed by the speaker. For instance, it’s used for confirmation as in “Korede ii na” (This is ok, isn’t it?), to express a wish as in “Hayaku konai ka na” (I hope he/she gets here soon), or to express an impression as in “Kore oishii na” (This is delicious). Sometimes, it is used when one mutters something to oneself as in “Ikeba yokatta na” (I should have gone), or “Ryokou ni ikitai na” (I’d like to travel). It can also be used to prohibit something as in “Zettai miru na” (Don’t look), or to make an order as in “Hayaku arukina” (Walk faster). In these cases, it is not interchangeable with “ne.” Adding “na” as in “Umaku itta na” (Well done), or “Owarasete kara kina” (Come after you’ve finished) is primarily a masculine style of speech. These days women also use it in this way when they are among intimate friends. However, the “na” used to remind, prohibit or make an order is basically used by men. It is rude to use it with your superiors. Even if the person you’re talking to uses it, if you are a woman or if the person you are talking to is your superior, you should reply politely using “ne.” Example. Teacher: “Kyou no shiai ha, yoi kekka ga deta na” (You did well in today’s match). Student: “Hai, higoro no doryoku ga mi wo musubimashita ne” (Yes, my efforts really paid off). Elderly men often add “na” to the end of formal sentences. Example: “Kare ha, gyougi ga ii desu na” (He has good manners). But it sounds rather strange if used by young men or women.