It is known that the first character in a two-"三声"-character word is prounounced as "二声"。For example,
勇敢 （ㄩㄥˇ ㄍㄢˇ）is usually pronounced as "（ㄩㄥˊ ㄍㄢˇ）".
How about when in a sentence there are some consecutative "三声" characters?
Say the following sentence:
How to pronounce the tones?