• Could and couldn’t
Could to show that something is possible / ability in the past.
Example : When I was young, 40 years ago, I could jump higher than a tree
(saat saya muda, 40 tahun yang lalu, saya bisa melompat melampaui tinggi pohon)
Couldn’t to show inability in the past.
Example : I couldn’t run 20 kilometers.
(saya tidak mampu berlari sejauh 2o kilometer.)