Present & Past
  PRESENT PROGRESSIVE AND SIMPLE PRESENT
  SIMPLE PAST 
  PAST PROGRESSIVE AND SIMPLE PAST 
  USED TO AND WOULD 
  WH-QUESTIONS
  The Future
  FUTURE 
  FUTURE TIME CLAUSES 
  Present Perfect
  PRESENT PERFECT: SINCE AND FOR 
  PRESENT PERFECT: ALREADY, YET, AND STILL 
  PRESENT PERFECT: INDEFINITE PAST 
  PRESENT PERFECT AND SIMPLE PAST 
  PRESENT PERFECT PROGRESSIVE AND PRESENT PERFECT 
  Modals & Similar Expressions
  ABILITY AND POSSIBILITY: CAN, COULD, BE ABLE TO 
  PERMISSION: CAN, COULD, MAY, DO YOU MIND IF 
  REQUESTS: CAN, COULD, WILL, WOULD, WOULD YOU MIND 
  ADVICE: SHOULD, OUGHT TO, HAD BETTER