"substantial reason to" is correct and can be used in written English.
You can use this phrase when you are trying to provide an explanation for why something is true. For example, "There is a substantial reason to believe that the new business plan will be successful."
For this alone, there is substantial reason to give thanks.
Moreover, even if there was, there is substantial reason to doubt that such ads would influence an election's actual outcome.
"The second trial has not altered my perception, namely that there's substantial reason to believe he's guilty.
In 1960, John Kennedy vowed to increase defense spending in order to correct a Soviet "missile gap" that (as he had substantial reason to know) did not exist.
Lis Smith, a spokeswoman for the Obama campaign, said that since there was "substantial reason" to doubt Mr. Romney's claims, "we have a simple message for him: prove it".
The OCE can only probe or punish sitting members of Congress.In early 2010 the OCE found "substantial reason to believe" that Nathan Deal, then a congressman from northern Georgia, had used his position to enrich himself.
He blamed police for too often greeting complainants with scepticism and inertia, and said officers "must absolutely accept the victim's version of events unless there are very substantial reasons to do otherwise".
There are, however, substantial reasons to believe that these results are simply due to chance.
However, most experts do not consider that oestrogen-containing contraceptive pills are an absolute contraindication if there are substantial reasons to choose these [77].
First, despite the rebound of the Dow Jones Industrial Average today, there are still substantial reasons to be nervous about the financial markets.
From these findings, the guideline concludes that there are substantial reasons to generally offer IOL after 41 completed weeks of pregnancy, and to strongly recommend IOL after 41 + 3 weeks.
