verb
ADVERB
▪ badly , seriously , severely
▪ dramatically , quickly , rapidly , sharply
▪ slowly
▪ gradually , steadily
▪ significantly
▪ further
VERB + DETERIORATE
▪ begin to
▪
His health began to ~ quite seriously.
▪ continue to
▪ be likely to
PREPOSITION
▪ into
▪
The unrest rapidly ~d into civil war.
Deteriorate is used with these nouns as the subject: ↑ condition , ↑ eyesight , ↑ health , ↑ hearing , ↑ relation , ↑ relationship , ↑ service , ↑ sight , ↑ situation , ↑ weather