present perfect continuous: has ('s) / have ('ve) + been + ing present perfect simple: has ('s) / have ('ve) + past participle If the contracted forms present the greatest difficulty, it will be ...

There are some verbs that we don’t usually use in the continuous form. They are often verbs ... (h) Only in winter. [Use the present simple for truths and facts.] 2. Is it snowing in the UK?