1. Expressing degrees of likelihood.
The sentences below are from a news report about NASA's calculations of the possiblitity of a giant asteroid, called XF11, colliding with Earth. Put the sentences into one of the two boxes below.
2. Expressions of likelihood.
Could is a modal verb. Probably is not a modal verb – it is an adverb.
Divide the expressions below into modal and non-modal expressions of likelihood.
For more information about likelihood and probability see the Grammar Reference.