Exercise on Past Perfect Progressive Form negative sentences in Past Perfect Progressive. John / money / collect→ you / cards / play→ his head / ache→ we / on the lake / sail→ they / at me / shout→ she / in London / teach→ they / trees / plant→ she / her room / tidy→ they / on the task / concentrate→ he / the problem / discuss→ Back to pool of exercises. ►