Airplane parts are checked for that periodically. Airplane parts are checked periodically. Periodically the glacier forms a dam separating the lake into two. We are now seeing that in fact Mars probably does have water – not liquid water – that there is ice just below the surface and there's even just recently tantalizing evidence that perhaps water does flow periodically
Now that he's retired, he plays golf regularly People who exercise regularly are less likely to feel stress. They meet regularly, once a month. We should eat often, little and regularly. You have to water the plants regularly.