ملخص الدرس / الثآنية ثانوي/اللغة الإنجليزية/Grammar/could-managed to
the example:
Arab-Islamic scholars were able/ managed to establish longitudes and reform the calendar.
Europe was able / managed to develop because the Arabs brought with them the seeds of a new enthusiasm for science.
For expressing ability in a particular situation, we use :
was/were able to + stem or managed to + stem