Hello Sarah! I wasn't sure about the differences for several of these myself, so I did some googling. These are my findings while browsing chiebukuro/hinative/ALC:たちまち an intentional action(similar to すぐに)彼はたちまち英語がうまくなった He made rapid progress in English.にわかに more formal その提案にはにわかに賛同はできない I cannot readily consent to that proposal.不意に unexpectedly 不意に問われて答えに困った I was at a loss for an answer. (ふと is more common in conversation)偶然 chance/coincidence 駅で偶然出会った We bumped into each other at the station.突如 seems to be common in novels and is not used in conversation. 1224年に突如として急死した (He) died suddenly in 1224.The difference between 急に・いきなり・突然 is a bit more subtle. いきなり seems to be used to say that an action took a shorter time than expected, while the others are not expected.「彼は家から○○飛び出してきた」He suddenly flew out of the house. You can use 急に・いきなり・突然 because we have no expectation of time.「第一問からいきなり詰まってしまった。」I suddenly got stuck on the first question , You can use いきなり but not 急に・突然 because the person got stuck faster than expected (There is a time expectation).For 急に vs 突然, 急に is used more widely. おなかが急に痛くなった My stomach suddenly started hurting - (It's unexpected, but is quite common and not shocking. )突然空から人が降ってきた A person suddenly fell from the sky - (It's definitely surprising and not something you see every day.)急に用事ができた Something suddenly came up. (This might have taken more than a moment but was unexpected)突然路地から子供が飛び出して来た」A child suddenly jumped into the alley. (In a moment)Please correct me if I am wrong. 勉強になりました!
私は土曜日に日本語のZoomがはじめました!I created it to give students an opportunity to practice speaking Japanese Language outside of the lesson classroom, to provide an environment where students can help one another and a place where students can practice causal Japanese Language. I invite Senseis, Students and Japanese Language Speakers/Learners on Nihongo-Pro to attend if you want to We will be doing the meetings every Saturday at 9 PM. Here is the Zoom Meeting Information:日:土曜日, 時間:9PM (Eastern Time United States), パスワード:2NEuQz Personal Meeting: 211−561−9156 レジス モリス
はじめまして!私はモリスレジスとうもします。アメリカ人です。南ランシングにすんでいます。仕事はマッサージセラピストです。私はねこがろっぴきいます。しゅみは日本の音楽を聞きますと日本のドラマを見ますと歌を歌いますと日本のしょどをしますと日本語をべんきょうします。松崎しげるとBackstreet BoysとJoe Hisaishiをよく聞きます。私は2しゅうかんまえぐらい本を出しました。愛のメモリーと I Want It That Wayが大好きです。私は日本語の人に会いたい。私も日本語をはなしたい。 レジス モリス