Sometimes or sometime?
Sometimes means ‘not always or not often’: …

sometimes | American Dictionary

sometimes
adverb[ not gradable ]
us/ˈsʌmˌtɑɪmz/
on some occasions but not all the time:
Sometimes you think you can’t really trust anybody.

Examples of sometimes

sometimes
The plans sometimes symbolize more than they explain, especially where large black surfaces representing the earth graphically detract from our reading of space and form.
This is surprising, given that questions of revenue generation affect ordinary people in basic and sometimes very serious ways.
Sometimes the cremated remains are placed in an urn, but more commonly they are scattered in a small pit or placed in an organic container.
Sometimes, and with some letters (especially at the youngest age level), phonetic letter names are produced.
The soft palate, uvula, redundant pharyngeal tissues, and sometimes the tonsils are removed (51).
For example, sometimes it will be in the interests of the effectiveness of the relationship that both parties make asset-specific investments.
On a technical note, the maps are so blurred as to be sometimes unreadable and the print quality is light and indistinct on some pages.
Sometimes research is prompted by a technical issue.
He shows that the introduction of such systems has sometimes been problematic because of political, practical, and technical factors.
It sometimes took the form of attempts to introduce new social groups into the workforce and following an old practice to diversify its social composition.
In the present study, runs involving 11 parameters sometimes took 5-h to complete.
Certainly such processes may sometimes relate causally to changes in material conditions including subsistence resources and practices.
This sometimes involves ideas related to symbolic value, but the discussion of these is beyond the purview of this paper.
A third weakness in presentation is that information is sometimes given diffusely instead of in one section or chapter, thereby reducing effective communication of ideas.
This intuition has sometimes been stated in previous studies.
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