Dear all,
as far as I know, から normally follows the plain form when it means "because" and you leave it to the second half of the sentence to set the level of politeness. But I have found several books for beginners which have you form sentences like this:
(1) ちょうど向かいに二十階のビルが立っていますから、なにもみえません。「Assimil]
(2) あ、雨が降ってきましたから、地下鉄にのりましょう。[Assimil]
(3) 私は中国語が少しできますから、おともしましょうか。[Assimil]
(4) 必ず行きますから、待っててください。[Assimil]
(5) 今週の土曜日に浅草でお祭りがありますから、スミスさんは加藤さんと浅草にいきます。[Japanese for busy people]
(6) [talking about a restaurant]: ええ、時々来ます。美味しいですから。[Japanese for busy people]
So, question for the native speakers: do all of these sound natural to you? Would you say it like this - or differently? Does it depend on the situation - or are some of these gaijin textbook phrases only (5 sounds particularly strange to me) ;-) Thanks much in advance!
Aurelio

