Have or Has

Base Form have / Past Simple had / Past Participle had / Gerund having
Present Simple		We often have guests over for dinner.
Present Simple Passive		Showers are often had in the morning.
Present Continuous		Peter is having breakfast at the moment.
Present Continuous Passive		Breakfast is being had in the dining room this morning.
Present Perfect		He has had a lot of luck!
Present Perfect Passive		Meals have been had in the dining room this month.
Present Perfect Continuous		We have been having problems for a while.
Past Simple		Alice had a shower before she left for work.
Past Simple Passive		Lunch was had on the balcony last Saturday.
Past Continuous		We were having lunch when she telephoned.
Past Continuous Passive		Lunch was being had when she telephoned.
Past Perfect		Oliver had already had lunch when I arrived.
Past Perfect Passive		Lunch had already been had when the guests arrived.
Past Perfect Continuous		Susan had been having a hard time when Peter decided to give her a helping hand.
Future (will)		You will have a good time!
Future (will) passive		A good time will be had by all!
Future (going to)		We are going to have a great time at the park.
Future (going to) passive		A great time is going to be had by all the guests.
Future Continuous		This time tomorrow we will be having lunch on the beach.
Future Perfect		She will have had her meeting by the time he arrives.
Future Possibility		She might have an appointment later today.
Real Conditional		If she has any problems, she will ask Jack for help.
Unreal Conditional		If she had any problems, she would ask Jack for help.
Past Unreal Conditional		If she had had any problems, she would have asked Jack for help.
Present Modal		You can ask the doctor for advice.
Past Modal		You must have had a wonderful time!