#1 You're right. #2 My grandfather has so many grandchildren now, he sometimes can't keep track of / can't remember their names,....
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AnonymousTo me, the "be" does not sound good at all. I would add something like "might" or "can" before the "be".You are right.
Anonymous My grandfather has so many grandchildren now, he sometimes stops being able to follow their names,..The sentence is poorly written. It should be the following.