underpin

《簡單過去式》
I underpinned
You underpinned
He underpinned
She underpinned
It underpinned
We underpinned
You underpinned
They underpinned

《簡單現在式》
I underpin
You underpin
He underpins
She underpins
It underpins
We underpin
You underpin
They underpin

《簡單未來式》
I will underpin
You will underpin
He will underpin
She will underpin
It will underpin
We will underpin
You will underpin
They will underpin

《過去進行》
I was underpinning
You were underpinning
He was underpinning
She was underpinning
It was underpinning
We were underpinning
You were underpinning
They were underpinning

《現在進行》
I am underpinning
You are underpinning
He is underpinning
She is underpinning
It is underpinning
We are underpinning
You are underpinning
They are underpinning

《未來進行》
I will be underpinning
You will be underpinning
He will be underpinning
She will be underpinning.
It will be underpinning
We will be underpinning
You will be underpinning
We will be underpinning

《過去完成》
I had underpinned
You had underpinned
He had underpinned
She had underpinned
It had underpinned
We had underpinned
You had underpinned
They had underpinned

《現在完成》
I have underpinned
You have underpinned
He has underpinned
She has underpinned
It has underpinned
We have underpinned
You have underpinned
They have underpinned

《未來完成》
I will have underpinned
You will have underpinned
He will has underpinned
She will have underpinned
It will have underpinned
We will have underpinned
You will have underpinned
They will have underpinned

《過去完成行進》
I had been underpinning
You had been underpinning
He had been underpinning
She had been underpinning
It had been underpinning
We had been underpinning
You had been underpinning
They had been underpinning

《現在完成行進》
I have been underpinning
You have been underpinning
He has been underpinning
She has been underpinning
It has been underpinning
We have been underpinning
You have been underpinning
They have been underpinning

《未來完成行進》
I will had been underpinning
You will had been underpinning
He will had been underpinning
She will had been underpinning
It will had been underpinning
We will had been underpinning
You will had been underpinning
They will had been underpinning