 The entire web itself can be used as a corpus to some degree, despite its constantly changing content, its multilinguality, its many tables and images, and its total lack of quality control; but when it is, the outputs of searches are nearly always cleaned by disregarding unwanted results. For example, Google searches are blind to punctuation, capitalization, and sentence boundaries, so search results for to be will unfortunately include irrelevant cases, such as where a sentence like Do you want to? happens to be followed by a sentence like Be careful.