All with the verb: We can all swim.

When all refers to the subject of a clause, it can go with the verb, in ‘mid-position’ (for details of word order, (see here).

• We can all swim.
• The guests have all arrived.
• Those apples were all bad.
• My family all work in education.

Note that these meanings can also be expressed by using all (of) with the subject (see here).

• All of us can swim.
• All (of) the guests have arrived.