To answer your question, to detect words, you have to use commands like MID$(), LEN(), and a FOR loop. You should make it scan the sentence from left to right: whenever it encounters a space, make it save in an array everything it scanned between the last space and the one it just found. I know it sounds complex (and it is), but if you can understand three languages, you can understand this. :P
1そうだね プレイ済み