Uso de Unless / As long as / Provided/providing

Unless = except if or only if

You can't go in unless you have a ticket.

Significa:

• You can't go in except if you have a ticket.
• You can't go in only if you have a ticket.

Usamos unless para avisarmos:

• We will be late unless we hurry. (except if we hurry)

No lugar de unless podemos usar if....not:

• We will be late if we don't hurry.

As long as or so long as, provided(that) or providing(that) = Essas expressões significam 'if' 'on condition that':

• You can use my car as long as/so long as you drive carefully.

Você pode usar meu carro com tanto que você dirija com cuidado. - esta é a condição

• Travelling by car is convinient provided/providing you have somewhere to park.

Viajar de carro é conveniente mas somente se você tiver onde estacionar.

Quando usamos frases no futuro, não usamos will depois de unless/as long as/provide/providing. Usamos o Present Simple :

• We will be late unless we hurry.(não 'unless we will hurry').
• Providing she studies hard, se will pass the exam.(not 'providing she will study').

Best wishes!