Student or Learner
A question arises when I read the following sentences. Please, help me to get rid from this question.
"Plopping an egg in a glass of water is a quick way of testing if it is fresh. However, eggs may float without actually being bad. If you're not sure, just crack them open."
Why there has no 'to' before the word 'open' in the previous sentence? What difference will appear if I place 'to' before 'open'?
You crack eggs open. You don't crack them to open.
"He broke open the safe." No 'to'. You could consider "crack open" and "break open" to be phrasal verbs. It's separable.
"He broke the safe open; He cracked open the eggs" are also good.