Words from The Same Family - Certain v Certainly

Certain (adj) – without doubt

Ø     Are you absolutely certain that’s Gary’s mobile number?

Ø     The police seem certain (= sure) that they will catch the robbers.

Certainly (adverb) – in no doubt

Ø     Hannah was certainly upset when she arrived at work this morning.

Ø     We’re not rich, but we’re certainly not poor.

Ø     His time in the army certainly toughened him up mentally and  physically.