you must think before acting
'hay que' is impersonal (no specific subject). Followed by infinitive.
You must think before acting, especially in important decisions.
—What would you tell him? —That you must think before acting.
In moments of crisis, you must think before acting.
You must think before acting, especially in important decisions.
—What would you tell him? —That you must think before acting.
In moments of crisis, you must think before acting.