15. ABILITY I would like to be able to speak four languages TO-INFINITIVE I love being able to use sign language “ -ING FORM” I would be able to sign I could sign CONDITIONAL I will be able to sign FUTURE I had been able to sign PAST PERFECT I have been able to sign PRESENT PERFECT I was able to sign I could sign PAST SIMPLE I’m able to sign I can sign PRESENT SIMPLE BE ABLE TO CAN