Kyū Ni & “~hajimemasu”  

“Kyū Ni” means “Suddenly”. Example:
It’s suddenly rains – Ame ga kyū ni (furu)furi dashimashita

The train suddenly moves – Densha ga kyū ni (ugoku)ugoki dashimashita

Dad suddenly got angry – Chichi ga kyū ni (okoru)okori dashimashita
Meaning : Ame (Rain), Densha (Train), Ugoku (Move), Chichi (Dad), Okoru (Angry / Mad)

“~hajimemasu” means “Start to~”. Example:
At last, the snow started to fall – Yuki ga tōtō furi hajimemashita

I always start to prepare dinner at around 6 o’clock – Itsumo 6 ji goro, ban gohan o tsukuri hajimemasu

I started to write novel when I was a student – Gakusei no toki, shōsetsu o kaki hajimemashita
Meaning : Tōtō (At Last), Itsumo (Always), Gakusei (Student), Shōsetsu (Novel)

~ri  

“~ri” is used to indicate that you will / can do multiple things. This should be used to attach in past tense verbs.

Example :
Kaku (Write) – Kaita (Past Tense) = Kaitari

Q : Where wouldyou go during summer holiday? – Natsu yasumi ni wa doko e ikimasu ka?
A : I’ll go to sea and mountain – Umi e ittari, yama e ittari shimasu.
Meaning : Natsu (Summer), Yasumi (Holiday / Rest), Umi (Sea), Yama (Mountain)

Remember, the “~ri” used in tha last verb must be followed by “shimasu”

Q : What would you do on Sunday? – Nichiyōbi ni wa nani o shimasu ka?
A : Usually I will take a walk and read books – Taitei sanpo o shitari, hon o yondari shimasu
Meaning : Taitei (Usually), Sanpo (Take a Walk)

You may notice that a similarity with my previous lesson on the use of “~shi“. However “~shi” is used to define that you can do one thing and also another thing. In this case, “mo” is necessary when using “~shi”.

Hope this doesn’t confuse you. If you need futher clarifications, feel free to post your question here.