Therefore, Microsoft owes its success to the good fortune of being the pre-eminent operating system on IBM PCs.
The success of Microsoft is based on it's operating system.
Microsoft would have been just as successful without any operating system.
The fight started.
A young woman using her phone.
One may wish to allow extra days for unforeseen circumstances.
The dogs are in teh water
The second is to be sure about who is going to win.
The men are building a new chimney.