Identify the type of modality

Identify the type of modality for the sentences below.

(The sentences are taken from from Kearns, D. (2000). Semantics. Basingstoke: Macmillan. p. 65)

a) Necessarily, a bachelor is unmarried. (:vips 7587:)

b) A child could have invented the mousetrap. (:vips 7588:)

c) If wishes were horses beggars would ride. (:vips 7589:)

d) The lake is sure to freeze tonight. (:vips 7590:)

e) Villager's goats may graze on the green. (:vips 7591:)

f) Right-turning traffic must give away. (:vips 7592:)