| I | shell |
|---|---|
| you | shell |
| he/she/it | shells |
| we | shell |
| you | shell |
| they | shell |
| I | shelled |
|---|---|
| you | shelled |
| he/she/it | shelled |
| we | shelled |
| you | shelled |
| they | shelled |
| I | have | shelled |
|---|---|---|
| you | have | shelled |
| he/she/it | has | shelled |
| we | have | shelled |
| you | have | shelled |
| they | have | shelled |
| I | had | shelled |
|---|---|---|
| you | had | shelled |
| he/she/it | had | shelled |
| we | had | shelled |
| you | had | shelled |
| they | had | shelled |
单语范例（未经PONS编辑处理）
It shelters itself in its shell, then strikes back with spouts of water at every opportunity.
en.wikipedia.org However, because of their minute size, micromollusks often go unnoticed by beachcombers, shell collectors and even more serious conchologists.
en.wikipedia.org The species is particularly characterized by its double columellar processes in the apertural dentition, a splendid discriminating character in shell morphology in this group.
en.wikipedia.org This whitish shell shows four rows of spiny, pointed nodules with numerous smaller spines between.
en.wikipedia.org The periphery of the shell is angulated, and tuberculate, as well as the body whorl below it.
en.wikipedia.org