Which of the following in the correct English translation of this Bangla sentence? ”পাতাগুলো যখন ঝরে পড়বে তখন গাছগুলো ভিন্ন রূপ দেখাবে।”

The trees will looks different when the leaves have fallen off.

The trees will look different when the leaves have fallen off.

The trees would look different when the leaves fallen off.

The trees will look different when the leaves had fallen off.